Target creature you control has base power and toughness 4/4 until end of turn.

Tap up to one target creature. Creatures you don't control don't untap during their controllers' next untap step.
Flashback {4}{U}

Corrupt — Each player exiles the top X cards of their library. You may cast a spell from among them with mana value X or less without paying its mana cost. If you control a permanent with greater mana value than this spell, you may cast up to two spells with mana value X or less from among them without paying their mana costs instead.

Target opponent reveals their hand. You choose a nonland card with mana value 2 or less from it or a card from their graveyard. Exile that card.

Target player reveals their hand. You choose a nonland card from it or a card from their graveyard. Exile that card. You lose 1 life.

Look at the top three cards of your library. Put one into your hand and the rest into your graveyard.
Flashback—{B}, Discard a card.

Target creature gets -3/-3 until end of turn. When that creature dies this turn, create a 1/1 colorless Cyborg artifact creature token.

When Ascend to Power enters, you may sacrifice a creature, discard a card, or pay 3 life. If you do, draw two cards.
You've sacrificed a nonland permanent this turn.
You've discarded a card this turn.
You've lost life this turn.

Whenever this Subroutine runs, you draw three cards and you lose 3 life.

When this Subroutine enters, you create two 1/1 black Jellyfish enchantment creature tokens with flying, draw two cards, and gain 2 life.
Whenever this Subroutine leaves the battlefield or runs, you sacrifice a creature, discard a card, and lose 1 life.

Target opponent loses 3 life unless they discard a nonland card, then loses 3 life unless they sacrifice a nonland permanent. You gain life equal to the amount of life lost this way.

At the beginning of your end step, for each opponent with an even number of cards in hand, they lose 3 life and you gain 3 life.
[+1]: Target player draws a card and loses 1 life.
[–4]: Target opponent exiles one or more cards from their hand. Then you may have that player exchange their hand and the exiled cards.

Choose up to X, where X is one plus the number of creatures you control with level counters on them.
• Each opponent discards two cards.
• Creatures your opponents control get -1/-1 until end of turn.
• Each opponent loses 3 life and you gain 3 life.

Choose one. If this spell's flashback cost was paid, instead choose three and you may choose the same mode more than once.
• Target player sacrifices a creature and a planeswalker.
• Target player discards two cards, then exiles their graveyard.
• All creatures get -2/-2 until end of turn.
Flashback {7}{B}{B}

Destroy target creature if it has power 3 or less or if you control a creature with flying.

Choose one —
• Target creature gets +2/+0 and gains indestructible until end of turn.
• Target player sacrifices a creature.

Whenever an opponent loses life for the first time each turn, they lose 3 life.
Whenever an opponent discards a card for the first time each turn, they discard a card.
Whenever an opponent sacrifices a permanent for the first time each turn, they sacrifice a nonland permanent.

Whenever a creature you control deals combat damage to a player, you may sacrifice it. If you do, draw a card. Otherwise, surveil 1.

Choose one —
• Return target creature card from a graveyard to its owner's hand.
• Exile target creature card in a graveyard, then draw a card.

Destroy target creature. Create two Berry tokens.

As an additional cost to cast this spell, exile a card from your graveyard.
Search your library for a card with the same mana value as the exiled card, reveal it, put it into your hand, then shuffle. You lose 2 life.

Integrate each nontoken creature you don't control with power 2 or less.

Whenever you attack, if Cursed Claymore entered this turn, attach it to target attacking creature.
Equipped creature gets +2/+1. As long as equipped creature is a Ruin, it's a creature in addition to its other types.
Equip {2}

Damn to Hell deals X damage divided as you choose among any number of target creatures and/or planeswalkers and you gain X life, where X is the number of Swamps you control plus the number of cards with a cycling ability in your graveyard.
Swampcycling {2}

Target player discards two cards. Exile their graveyard.