Guildpact

{T}: Add {C}. {3}{W}{B}, {T}: Target player loses 1 life and you gain 1 life.

{W}, {T}: Tap target creature.

Parallectric Feedback deals damage to target spell's controller equal to that spell's mana value.

({U/R} can be paid with either {U} or {R}.) When Petrahydrox becomes the target of a spell or ability, return Petrahydrox to its owner's hand.

This spell can't be countered. Bloodthirst X (This creature enters the battlefield with X +1/+1 counters on it, where X is the damage dealt to you...

Enchant creature Enchanted creature can't attack or block. Enchanted creature has "At the beginning of your upkeep, you lose 1 life."

{B}, Sacrifice a creature: Target creature gets -1/-1 until end of turn.

Whenever another creature enters the battlefield, its controller loses 1 life.

You may have creatures you control assign their combat damage this turn as though they weren't blocked.

Destroy all enchantments target player controls.

Replicate {1}{R} (When you cast this spell, copy it for each time you paid its replicate cost. You may choose new targets for the copies.) Pyromati...

The next sorcery spell you cast this turn can be cast as though it had flash. (It can be cast any time you could cast an instant.) Draw a card.

Bloodthirst 1 (If an opponent was dealt damage this turn, this creature enters the battlefield with a +1/+1 counter on it.) {R}, {T}: Attacking cr...

Return target nonland permanent with mana value X to its owner's hand. Draw a card.

{3}{B}, {T}: Target creature gains swampwalk until end of turn. (It can't be blocked as long as defending player controls a Swamp.) {1}{B}: Regene...

When Revenant Patriarch enters the battlefield, if {W} was spent to cast it, target player skips their next combat phase. Revenant Patriarch can't...

At the beginning of your upkeep, Rumbling Slum deals 1 damage to each player.

Counter target spell unless its controller pays {1}. Draw a card.

{B}, Sacrifice a creature: Destroy each creature with the same mana value as the sacrificed creature.

Savage Twister deals X damage to each creature.

Bloodthirst 2 (If an opponent was dealt damage this turn, this creature enters the battlefield with two +1/+1 counters on it.) Trample

Target creature gets +4/+0 until end of turn. Another target creature gets -4/-0 until end of turn.

{R}, Sacrifice a creature: Scorched Rusalka deals 1 damage to target player or planeswalker.

Destroy target nonwhite, nonblack creature. Create a 1/1 white Spirit creature token with flying. Haunt (When this spell card is put into a graveya...