Damned — When this creature enters, if you've sacrificed a permanent this turn, create a Treasure token.

When this land enters, you gain 2 life.
{T}: Add {C}. You may spend this mana as though it were mana of any color to activate cycling abilities or cast spells with a cycling ability.

Whenever another creature you control enters, if that creature's power is greater than this creature's power, you may put a +1/+1 counter on this creature.
{2}{G}: Move any number of +1/+1 counters from this creature to another target creature you control. Activate only as a sorcery.

Put a +1/+1 counter on each creature you control. They get +1/+1 and gain trample until end of turn.
Cycling {2}

As an additional cost to cast this spell, sacrifice an artifact or enchantment or pay {2}.
Exile the top three cards of your library. You may play them until the end of your next turn.

When this Subroutine enters, you may discard a card. When you do, it deals 4 damage to target creature or planeswalker.
Whenever this Subroutine runs, create a 4/4 red Error creature token with menace.

Whenever you cast a noncreature spell, this creature gets +2/+1 until end of turn.

Draw a card.
Corrupt — If you control a permanent with greater mana value than this spell, surveil 2.

This spell costs {1} less to cast for each tapped creature you control.
Counter target spell unless its controller pays {X}.

This spell can't be countered.
Destroy all permanents without activated abilities.

Each player who doesn't control a planeswalker can't cast more than one spell each turn.
Ayeshicycling {3}

Exile target creature you control, then return that card to the battlefield under its owner's control.

Flash
{1}{U/B}, Discard this card: Surveil 1, then draw a card.

Deathtouch
Once during each of your turns, when you sacrifice a nontoken, nonland permanent, you may create a tapped token that's a copy of it.

Flying
Level up {U/R}
[level 2-4] Flying, prowess
[level 5+] Flying, prowess, prowess, prowess

When this creature enters, exile all other nontoken, non-Error creatures you control. For each card exiled this way, create a 8/9 white Error creature token with “When this token leaves the battlefield, return the exiled card to the battlefield under your control.”

Plasma Strike deals 3 damage to target attacking, blocking, or tapped creature.

Whenever you cast a spell with mana value 4 or greater, put two +1/+1 counters on this creature.

Time loop
I — Create a 1/1 green Spirit creature token.
II — Put a +1/+1 counter on target creature you control.
III — Put a +1/+1 counter on each creature you control with a +1/+1 counter on it.

At the beginning of each player's upkeep, that player mills X cards, where X is the number of tapped permanents their opponents control.

Ninjutsu {3}{G}{U}
Whenever this creature deals combat damage to a player, you may put a creature card with mana value X or less that you own from outside the game onto the battlefield, where X is the amount of combat damage that has been dealt to that player this turn.

Flash
Flying
When this creature enters, exile target spell or nonland permanent. For as long as that card remains exiled, its owner may cast it by paying {3} rather than its mana cost.

Menace
Whenever one or more creatures you control deal combat damage to a player, sacrifice one of them.

As this artifact enters, choose mourning, oblation, or prayer.
• Mourning — Players can't discard cards to cast spells or activate abilities.
• Oblation — Players can't sacrifice nonland permanents to cast spells or activate abilities.
• Prayer — Players can't pay life to cast spells or activate abilities.

At the beginning of your upkeep, if you have 50 or more life, you win the game.
At the beginning of each end step, you gain life equal to twice the amount of life you’ve lost this turn.