Feraligatr

You may sacrifice a creature named Croconaw rather than pay this spells mana cost.
Whenever Feraligatr blocks a creature, it gains first strike until end of turn. {u}{u}, {t}: Feraligatr deals damage equal to its toughness to target attacking or blocking creature.
Fateful hour —As long as you have 5 or less life, Feraligatr has first strike and trample, and gets +1/+0 for each card in your hand.