Pruinae, Frostforest Iceslayer

First strike, haste
Suspend 2—{3}{r} (Rather than cast this card from
your hand, you may pay {3}{r} and exile it with three
time counters on it. At the beginning of your upkeep,
remove a time counter. When the last is removed, cast
it without paying it's mana cost.)
As long as Pruinae, Frostforest Iceslayer remains
suspended, lands your opponents control don't
untap during their untap step.