SwitchBlade

Haste, Double Strike, Vigilance
Whenever SwitchBlade deals combat damage to a creature, put X +1/+1 counters on it, where X is
the defending creature's toughness.
If SwitchBlade would leave the battlefield,
shuffle it back into it's owner's library.
"He was different before the void, of that I'm certain." Marwallah The Blind