Ambitious Thane -
Creature - Human Soldier
: Ambitious Thane deals 1 damage to each creature and player.
: Regenerate Ambitious Thane.
When a land becomes a creature, sacrifice Ambitious Thane.
3/3

043, the Bully
Legendary Creature - Lizard Berserker (R)
Menace
This creature attacks each turn if able, unless you tap an another creature you control.
This creature cannot divide it's combat damage between multiple objects.
Nah.
6/1

Theme: Tevish has been watching a lot of anime lately ("lately" defined loosely. Anime referenced may not be among those watched "lately")
Notes: Only have to guess the character for "A" for me to reveal the mess, any later letters serve to provide context.

001A

Legendary Creature - Human Incarnation
Remove a time counter from a permanent you control: 001A gets +1/+1 and your choice of First Strike, Flying, Trample, Vigilance, or Haste until end of turn.
3/2

001B

Legendary Artifact Creature - Human Spirit
Vanishing X
At the beginning of your end step, put time counters on 001B until there are X or more time counters on it.
0/3

001C

Sorcery
Target creature gains Vanishing and is a spirit in addition to its other types. Put 3-X Time Counters on it.

~~~

002A

Legendary Creature - Human Beast Soldier
Haste, First Strike
Whenever 002A attacks, if you both own and control it and an attacking creature named 002B, exile them, then meld them into 002C. 002C enters the battlefield tapped and attacking.
Whenever 002A and a creature named 002B block together, if you both own an control both of them, exile them, then meld them into 002C. 002C enters the battlefield blocking whatever 002A was blocking.
2/1

002B

Legendary Creature - Human Soldier
Skulk, Lifelink
(Melds with 002A)
1/2

002C
[White, Blue, and Red color indicator] Legendary Artifact Creature - Construct
First Strike, Trample
: 002C gains Indestructible until end of turn.
: 002C gains Flying until end of turn.
: 002C gets +1/+0 until end of turn.
At the beginning of each end step, exile 002C, then return each card melded into it to the battlefield under their owner's control.
6/6

~~~

003A

Legendary Creature - Human Wizard
, : Choose a noncreature permanent you control. Search your hand, graveyard, and Library for a noncreature card permanent with the same converted mana cost. Exchange those cards. If you searched your library this way, shuffle it.
3/2

003B

Legendary Artifact Creature - Spirit Wizard
Vigilance
: You may cast a card named 003C from your hand or graveyard without paying its mana cost this turn. (Normal timing rules still apply.)
4/6

003C

Sorcery
Choose a noncreature permanent you control. Search your hand, graveyard, and Library for a noncreature permanent card with the same converted mana cost. Exchange those cards. If you searched your library this way, shuffle it.

TK-03 |
Legendary Creature - Human Soldier

Absorb 1
As long as ~ is equipped, it has hexproof from instants, sorceries, and enchantments.

3/2

044, the Tyrant
Legendary Creature - Shapeshifter Demon
: This creature becomes a copy of a target creature with converted mana cost X until the end of turn.
: This creature deals X damage to a target creature.
: Put X +1/+1 counters on this creature.
: Shuffle this card from your graveyard into your library.
1/1

045
Legendary Artifact - Equipment
When this artifact enters the battlefield, name a card.
Equipped creature gains Protection from the named card.
Whenever a creature an opponent controls is dealt damage by an equipped creatue, exile it.
Equip

COME ON PEOPLE, you totally know those things in my eralier posts !

046, The Last [redacted]
Legendary Creature - Human Avatar Wizard (R)
: This creature gains Flying and Vigilance until the end of turn.
, : Tap or untap another target nonland permanent.
, : This creature deals 1 damage to a target creature or player.
, : Untap two target lands.
3/3

046 is Aang

Yes.

047, the Genius
Legendary Creature - Rat
At the beginning of your upkeep, if you have 8 cards in your hand, you win the game.
1/1

048, the Insane
Legendary Creature - Rat
At the beginning of your upkeep, exile the top card of your library. You may play it this turn.
1/1

It's Pinky and the Brain, yes Pinky and the Brain

Do I need to provide more hints, perhaps?

Added more hints.

TK-04 |
Legendary Creature - God

Flying
When ~ enters the battlefield, choose instant, sorcery, enchantment, or artifact. Each player reveals their hand, graveyard, and library and exiles all cards of that type. Each player shuffles their library then draws a card for each card exiled this way from their hand.
When ~ leaves the battlefield, shuffle all cards exiled by ~ into their owner's respective libraries.

"I merely act to maintain order in this world."

6/6

Well, yes, they are, are, are, are,
Are, are, are, are,
ARE!

049
Legendary Artifact - Vehicle
Crew 3
Whenever this vehicle is crewed, sacrifice one of the creatures tapped to crew it.
When you control no creatures, flip 049.
5/5
//////////////////////////////////////////////////////////////////////////////////////////
049'
Legendary Artifact - Vehicle
Crew 1
Whenever this vehicle is crewed, exile a creature card from your graveyard and Investigate.
Whenever you sacrifice a Clue, put a Lore counter on a creature card exiled with this artifact.
If you own at least 10 creature cards exiled with Lore counters on them, you win the game.
0/5

Come on, that one was very guessable if you experienced the (rather popular) source material !

050
Legendary Enchantment - Aura
Enchant creature you control
This enchantment costs less to cast if it targets the only creature on the battlefield.
Whenever enchanted creature deals damage, draw a card.
At the beginning of your upkeep, you may have enchanted creature fight another target creature.
Up to the challenge of any rival.

049 The only thing I can think of is "And Then There Were None"

050 Highlander?

Hints for mine

No and no.

051
Legendary Creature - Human Soldier
First Strike
When this creature enters the battlefield, crank all Contraptions you control.
You!
3/2

Come ooon, people!
Youuuuuu can totally guess that!

Added more hints. I'll give the answers if they have not been guessed by Christmas eve.