That Which Is Passed Through
Legendary Land — Gate (M)
: Add .
Tap X tapped untapped Gates you control: That Which Is Passed Through becomes an X/X Avatar creature with indestructible until end of turn. It's still a land.

Puppy Recipient
Creature — Human Citizen (C)
When Puppy Recipient enters the battlefield, it adopts. (To adopt, look the top five cards on your library. You may put a creature card with lesser mana value from among those cards onto the battlefield. Put the rest on the bottom of your library in random order.)
1/1

Incredible.

Selfless Retriever —
Creature — Dog (U)
Lifelink
When Selfless Retriever enters the battlefield, each player draws a card. If it was adopted, instead you draw a card.
2/2

Kind-hearted Orphan
Creature - Human (R)
When ~ enters the battlefield, if it was adopted, it and other adopted creatures you control gain indestructible until end of turn.
At the beginning of your upkeep, ~ adopts. If it does, adopted creatures other than ~ gain indestructible until end of turn.
[1/1]

Argos Waits for Ulysses
Enchantment — Saga (M)
I - Target creature you control adopts. Put a vigilance counter on the adopted creature.
II - Target creature with vigilance gains indestructible until your next turn. You may remove a lore counter from Argos Waits for Ulysses.
III - Return target creature card from your graveyard to the battlefield.

Delayed Gratification —
Enchantment — Saga (C)
III - Draw two cards.

Trivialized Trainer
Creature — Human Ranger (U)
When Trivialized Trainer enters the battlefield, target creature you control gains "Whenever this creature deals combat damage to an opponent, draw a card" until end of turn.
When Trivialized Trainer dies, put a curiosity counter on target creature you control. It gains "Whenever this creature deals combat damage to an opponent, draw a card."
"Clever girl."
2/1

Mu Yanling, Holding Back Devastation —
Planeswalker — Yanling (R)
Flash
When Mu Yanling enters the battlefield, exile target spell. When she dies, the exiled spell's owner may cast it without paying its mana cost.

Jace, Master of Contingencies
Legendary Planeswalker - Jace (M)
: Scry 1, then draw a card.
: Until the beginning of your next turn, whenever an opponent casts their first spell each turn, return it to that player's hand.
: Each opponent puts their hand on the bottom of their library in a random order, then draws that many cards. You draw up to X cards, where X is the number of cards yournopponents drew this way. You gain an emblem with "You have no maximum hand size."

Did you post that in the wrong place?

Pampered Pyredoodle
Creature — Dog (C)
As an additional cost to cast this spell, you may sacrifice any number of Foods. This spell costs less to cast for each Food sacrificed this way.
3/3

Paliano Terrier
Creature - Dog (U)
Whenever a Treasure you control is destroyed by a spell or ability you don't control, that source's controller loses 1 life.
Sacrifice a Treasure: ~ gets +1/+0 and indestructible until end of turn.
"Her toys are hers to do as she pleases, not yours; if she wishes to mangle her teddy beyond recognition, who are you to deny her?"
[2/2]

The Dog that Didn't Bark in the Night
Creature - Dog {R}
The Dog that Didn't Bark in the Night attacks each turn if able.
At the end of your turn, if The Dog that Didn't Bark in the Night didn't attack this turn, each opponent discards a card.
3/3

Ravager of Gilded Flesh-
Creature-Horror (M)
Menace
When Ravager of Gilded Flesh enters the battlefield, destroy each other creature you control. For each creature destroyed this way, draw a card and create two Treasure tokens.
Its arms as sharp as razors, its eyes as deep as gold.
6/6

Sic'em
Sorcery (C)
~ deals 3 damage to any target. If ~ is countered or any of this damage is prevented, return ~ to your hand at the beginning of your end step.

Drop the Ball
Sorcery — Trick (U)
As an additional cost to cast this spell, sacrifice an artifact.
You gain control of target artifact or creature you don't control until end of turn. Untap it and it gains haste until end of turn. If it's an Equipment, attach it to a creature you control.
, Exile Drop the Ball from your hand: Teach target non-Human creature you control this spell. (That creature gains ": Copy the taught Trick. You may cast the copy by paying all costs.")
The most valuable toy is the one in someone else's mouth.

Zoomies
Enchantment (R)
Creatures you control have haste.
Untap all creatures you control during each other player’s untap step.
At the beginning of each end step, if you control any untapped creatures, sacrifice Zoomies and return all creatures you control to their owners' hand.

Voidfold Hellkite

Creature - Fractal Dragon (M)
4/4

Voidfold Hellkite can't be countered.
Haste, myriad
When Voidfold Hellkite deals combat damage to a player, choose up to three target creatures and/or planeswalkers that player controls. Voidfold Hellkite deals 1 damage to the first creature or planeswalker chosen this way, 2 damage to the second, and 3 damage to the third.

Throw Them a Bone
Instant (C)
Target non-Human creature gets +3/+3 until end of turn. If you cast a Trick this turn, put a +1/+1 counter on that creature as well.

Trick or Treat

Sorcery (U)

Choose one --
- Search your library for a Trick card, reveal it, put it into your hand, then shuffle.
- Search your library for a Treat card, reveal it, put it into your hand, then shuffle.