Envoy of Inertia

Abjure {3}(You may have an opponent cast target
noncreature, nonartifact spell in their graveyard with
a converted mana cost 3 or greater for {0}, then exile it
to reduce this creature's mana cost by {2}.)
{t}, Exile Envoy of Inertia: Tap or untag target
nonland permanent. That permanent doesn't
untap as normal during its controller's next
untap step. Return Envoy of Inertia to the
battlefield under its owner's control at
the end of your turn.