Life gain pisses people off

Whenever you cast a spell, you gain 1 life for each spell you've cast this turn.

Pay 50 life: This artifact deals 50 damage to any target.

Whenever you gain life, put a +1/+1 counter on this creature.

Flying

Whenever you gain life, each opponent loses 1 life.

Sacrifice this creature: Target player loses 1 life and you gain 1 life.

Destroy target artifact or enchantment.

Vigilance (Attacking doesn't cause this creature to tap.)

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

At the beginning of your upkeep, if you have 40 or more life, you win the game.

Enchant creature

Enchanted creature gets +1/+1 and has flying and lifelink.

Choose one —

• Target player gains 3 life.

• Prevent the next 3 damage that would be dealt to any target this turn.

Whenever this creature is dealt damage, you may destroy target nonland permanent.

When this creature enters, you gain 4 life.

Destroy target creature.

This land enters tapped.

{T}: Add {W} or {B}.

({T}: Add {W}.)

Flying

When this creature enters, if your life total is less than your starting life total, it becomes equal to your starting life total.

Target player gains 4 life.

Landfall — If you had a land enter the battlefield under your control this turn, that player gains 8 life instead.

Whenever you gain life, target opponent loses that much life.

{T}: You gain 1 life.

({T}: Add {B}.)

Up to two target creatures each get +1/+2 until end of turn. You gain 2 life.

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)

{T}, Pay 2 life: Remove a counter from target nonland permanent.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)

Target opponent sacrifices a creature of their choice. You gain life equal to that creature's toughness.

Flying

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

{1}{W}{B}: Target creature gains lifelink until end of turn.

{1}{W}{B}: Whenever you gain life this turn, each opponent loses that much life.

Defender (This creature can't attack.)

Whenever you gain life, put a +1/+1 counter on this creature.

{5}{B}{B}, Sacrifice this creature: Target player loses X life, where X is this creature's power.