Tefga, Grand Behemoth

Tefga, Grand Behemoth costs {1} less to cast
for each non-token creature you control.
Whenever Tefga enters the battlefield or attacks, creatures you control gain haste, trample, and vigilance until end of turn.
Whenever Tefga deals combat damage to a
player, put a doublestrike counter on another
target creature you control.