Hell hound attack

Whenever you're dealt damage, you may put that many +1/+1 counters on this creature. At the beginning of your end step, remove all +1/+1 counters from this creature.

Whenever a creature you control attacks, it gets +2/+0 until end of turn and this enchantment deals 1 damage to you. Hellbent — As long as you have no cards in hand, if a source you control would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

Equipped creature can't be blocked and has shroud. (It can't be the target of spells or abilities.) Equip

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

Equipped creature has deathtouch and lifelink. (Any amount of damage it deals to a creature is enough to destroy it. Damage dealt by this creature also causes you to gain that much life.) Equip (: Attach to target creature you control. Equip only as a sorcery.)