Yeti Ambush

Put a 5/5 white and green Yeti creature token
with trample and haste onto the battlefield.
Sacrifice it at the end of your turn unless you
spend snow mana to cast Yeti Ambush.
Flashback {3}{s}{s} (You may cast this card from
your graveyard for its flashback cost. Then exile it.)
"Never climb a snowy mountain without an army."