Diabolic Tutor

Search your library for a card, put that card into your hand, then shuffle.

Swamp

Enchant creature
Enchanted creature gets -1/-1 for each Swamp you control.

Sacrifice a creature: Bloodthrone Vampire gets +2/+2 until end of turn.

{T}: Target attacking creature gets +1/+1 until end of turn.

Each opponent loses 3 life. You gain life equal to the life lost this way.

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

Enchant creature
Enchanted creature gets +1/+1 for each Plains you control and has flying.

Corrupt deals damage to any target equal to the number of Swamps you control. You gain life equal to the damage dealt this way.

At the beginning of your upkeep, you may gain 1 life.

Destroy target artifact or enchantment. You gain 4 life.

Prevent all damage that would be dealt to you and creatures you control this turn.