Frankenstrike

Trample, afflict 2
Whenever you cast your first creature spell
each turn, you may pay 4 life. If you do, return
target artifact from your grave to your hand with
mana value equal to that creature's power.
Otherwise, put a haste counter on target creature
you control.
When Snare-Oh and Blitzwolfer are on the
field under your control you may instead pay 2 life
to return an artifact to your hand instead of 4.