No Significant Harassment

Defender
Whenever you cast a spell from anywhere other
than your hand, create a 3/2 red Cat Mouse
creature token with haste and "At the beginning
of your upkeep, put a -1/-1 counter on this
creature."
{1}{r/g}: Exile the top card of your library. You may
play lands and cast spells from among cards
exiled this way for as long as you control No Significant Harassment.