Gammoth, Wild Frost

Trample
When Gammoth enters the battlefield or attacks,
put an ice counter on each of up to two target
permanents. Permanents with ice counters on
them are snow. Whenever a snow permanent you control becomes tapped, add {w} or {g} for each ice counter on that permanent. Until end of turn,
you don't lose this mana as steps and phases end.
{s}{s}: tap target permanent an opponent
controls.