Groth, The Brutalizer

Trample, Uncounterable.
Dash {8}{b}{r}
Whenever Groth enters the battlefield by dashing
, all players discard their hand. Groth gains riot,
for each card discarded this way. Instead of
returning it to your hand at the end of the turn,
put it at the bottom of your library.
Groth puts the BRUTAL in Brutal