Slippery Snake

Companion - Each card in your starting deck is a Creature and Land card. (If this card is your chosen companion, you may cast it from outside the game.)
Flash. Hexproof from its controller
End the turn. (Exile all spells and abilities from the
stack. The player whose turn it is discards down to
their maximum hand size. Damage wears off, and
"this turn" and "until end of turn" effects end.)