Whenever ~ attacks, you may exile a card from your hand face down until end of combat.
:0mana:: Target player names a card, then you reveal the exiled card. If it's the named card, untap ~ and remove it from combat. Otherwise, it gains first strike until end of turn.
Not sure this qualifies as "better", but...
Dreadnought of the Depths
Legendary Creature—Dreadnought (MR)
When Dreadnough of the Depths enters the battlefield, sacrifice it unless you sacrifice six islands.
Flash, first strike
When ~ enters the battlefield, it fights target attacking or blocking creature. Tap that creature and remove it from combat. (Whenever a creature with first strike fights, it deals damage before creatures without first strike)
*I realize that the first strike/fight interaction doesn't work like that at the moment, but thought it would be cool.
Whenever an artifact you control goes to a graveyard from the battlefield, put a +1/+1 counter on ~.
Remove X +1/+1 counters from ~: Destroy each artifact with converted mana cost equal to or less than X.
Kicker 1W and/or B
If Anavolver was kicked with its kicker, it enters the battlefield with two +1/+1 counters on it and with lifelink.
If Anavolver was kicked with its kicker, it enters the battlefield with a +1/+1 counter on it and with "Pay 3 life: Regenerate Anavolver."
Sacrifice ~: Creatures you control get +1/+2 until end of turn.
At the beginning of your upkeep, if no spells were cast last turn, transform ~.
(:symb:) Creature—Demon Werewolf
Sacrifice a creature: ~ gets +2/+1 until end of turn.
At the beginning of your upkeep, if a player cast two or more spells last turn, transform ~.