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

If you would gain life, you gain twice that much life instead. If you would draw a card except the first one you draw in each of your draw steps, draw two cards instead.

You may look at the top card of your library any time. You may play lands and cast spells from the top of your library. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost. {T}, Sacrifice ten nonland permanents: Each opponent loses 10 life.

Whenever you gain life, you may pay {2}. If you do, draw a card. {3}{W}: Create a 1/1 white Soldier creature token with lifelink.

Flying Double strike (This creature deals both first-strike and regular combat damage.) Lifelink (Damage dealt by this creature also causes you to gain that much life.) Whenever you gain life, draw a card.

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.

Creatures your opponents control enter tapped. Whenever a creature an opponent controls enters, you gain 1 life.

Each opponent loses two times X life. You gain life equal to the life lost this way.

Flying, lifelink This creature gets +4/+4 as long as you have 25 or more life.

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.

Whenever an opponent casts a noncreature spell, that player loses 2 life and you gain 2 life.

Destroy all creatures. You gain 1 life for each creature destroyed this way.