Homarid Shellstrider

Volatile- At the beginning of each upkeep, flip a coin, if you win the flip, Homard Shellstrider gets -1/+3 and gains hexproof until end of turn. If you lose the flip, Homarid Shellstrider gets +3/+0 until end of turn.
When Homarid Shellstrider becomes the target of a spell or ability, if it has power 2 or greater, sacrifice it.