Rubinia, Frigid Judgement

Whenever a snow permanent enters the
battlefield under your control, put an ice counter
on target permanent. At the beginning of the
next upkeep, remove all ice counters from all permanents.
Permanents with ice counters can't attack, block
or activate abilities that aren't mana abilites.
{s},{t}: Exile target nonland permanent with an
ice counter on it.