Arbhon, Rising Warden

Whenever a Treefolk or Plant you control dies,
create a colorless Seed artifact token with
"{1}, Sacrifice this artifact: Suspend target
creature card in your graveyard with X time
counters on it, where X is its power. It is a Plant
in addition to its other types." (At the beginning
of its owner's upkeep, remove a time counter from
that card. When the last is removed, the player plays
it without paying its mana cost. If it's a creature, it
gains haste.)