Past Tense
Instant
Return target creature to its owner's hand. If that creature entered the battlefield this turn, you may put it on top of its owner's library instead.
"Didn't you say our contact was here?"
"Well, yes; but he obviously isn't here now."

Muscle Tension
Enchantment — Aura
Enchant creature
Whenever enchanted creature becomes tapped, put a stun counter on it.
, Remove a stun counter from enchanted creature: Untap enchanted creature. It gets +1/+1 until end of turn.
Nothing hurts more than unspent potential.

Muscle Memory
Enchantment - Aura
Enchant creature.
Whenever enchanted creature becomes untapped, it gets +1+/1 until end of turn. If it has power and toughness greater than its base power and toughness, put a +1/+1 counter on it instead.
Do it again until you don't even think about doing it when you do it.

Prideful Muscle Man -
Creature - Human Warrior
Trample
~ can't attack or block unless it's power is greater than all other creatures on the battlefield.
At the beginning of your upkeep, put a +1/+1 counter on ~.
2/2

Pridebreaker Archon
Creature — Archon
Flying
Whenever Pridebreaker Archon attacks, each player chooses half of the creatures they control, rounded up. Then, destroy all creatures not chosen this way.
"The leonin reject the gods and taunt the hierarchs. They are children, proud of the mud piles they build and blind to the mercy that permits them to make messes."
4/4

Bane Breaks the Bat
Enchantment - Saga (R)
I - Create a 2/2 black and green Human Creature token.
II - Put a -1/-1 counter on target creature you control. It gets +3/+3 until ~ leaves the battlefield.
III - Target creature you control fights target creature you don't control. When a creature dies this way, its controller discards a card.

Bane's Venom Injector
Artifact — Equipment
Equipped creature gets -1/-1.
, Discard a card: Double equipped creature's power and toughness until end of turn.
Equip

Bone Injector —
Artifact — Equipment (C)
Living weapon
Equipped creature gets +1/+1 and has deathtouch.
Equip

Boneripper —
Creature — Dog Beast (U)
Any damage Boneripper deals in fights to creatures is enough to destroy them.
Prevent all damage that would be dealt to Boneripper in fights.
4/4

Ripper, Rogue Watcher
Legendary Creature — Human Warlock
When Ripper, Rogue Watcher enters the battlefield, choose any number of creatures you control. Look at that many cards on top of your library, put any number of them in your hand, then exile the rest. For each card put in your hand this way, sacrifice one of the chosen creatures at random.
3/1

Omniversal Rip —
Creature — Fractal (R)
Trample, haste, ward
At the beginning of your end step, sacrifice Omniversal Rip.
When Omniversal Rip dies, draw a card.
It was the last thing Merrik ever saw. But as the light left his eyes, it became the first thing he'd ever seen.
6/1

Omniversal Vision

World Enchantment
When Omniversal Vision enters the battlefield, each player inverts their library. (To invert a player's library, turn it upside down so the bottom card becomes the top card, revealed.)
Players play with their hands and libraries revealed.
When Omniversal Vision leaves the battlefield, each player shuffles their library. (Return those libraries face-down, unrevealed.)

Vision of Reality
Sorcery (U)
Choose target creature. Create an X/X green and blue Spirit creature token, where X is the difference between that creature's power and toughness.
"The soul is not of this world. Yet here we are, soul and all."
—Rago Tak, spiritual leader

Reality Revision

Instant
Target creature loses all abilities and becomes a Y/Y creature of the type or types and color or colors of your choice. Y is equal to 3, plus or minus X. If Y would be less than 1, Y is 1. (This effect lasts indefinitely)

Temporaral Revision
Instant
You gain life equal to the amount of life you lost this turn.
Draw cards equal to the the number of cards that left your hand this turn.
"Let's just pretend that didn't happen."
"Pretend? Why don't I just make it so it actually didn't happen?"

Temporal Snafu
Sorcery (M)
Take an extra turn after this one. Target opponent controls you during that turn.
Exile Temporal Snafu.
A wise man will have once said "Tinkering with time is dangerous."

Temporal Tantrum-
Sorcery
Take an extra turn after this one. Skip your next turn after that one.
"I want it now!" ~ Tesria, Born out of time

Planar Tantrum
Sorcery
Destroy all lands. For each land destroyed this way, its controller creates a 3/1 red Elemental creature token with haste and trample.
The worldsoul of Amonkhet can mourn no more.

Planebearer Ent —
Creature — Treefolk (R)
Kicker
Planebearer Ent enters the battlefield tapped with a stun counter on it. If it was kicked, it enters the battlefield untapped with a shield counter on it instead.
The weight of the world rests on its boughs.
7/7