Liam, Budding Intellectual

Liam is hexproof, except when in slumber.
Slumber 2 (You may tap Liam at your upkeep. If you do so, at your end step double Liam's power and toughness, and put a slumber counter on Liam
{x}{r}{u}{t}: Deal X damage to target creature or player, where X is the number of slumber counters on Liam. Return Liam to owners hand with zero counters
“Study while others are sleeping… and dream while others are wishing”