Ben Simmons

Ben Simmons can't attack an opponent or plainswalker unless that opponent controls no creatures. Ben Simmons can't attack alone.
{g/u}{g/u}{t}: Tap target creature. It stays tapped until
Ben Simmons untaps. During your untap step,
you may choose not to untap Ben Simmons.
{g/u}{g/u}{g/u}{g/u}: Until end of turn, target creature you control becomes unblockable and gains "when
this creature deals combat damage to a player,
draw a card."