Crash Survivors

Warp 4 — {4} (Rather than cast this card from your
hand, you may pay {4} and exile it with 4 warp
counters on it. At the beginning of your upkeep,
remove a warp counter. When the last is removed,
conjure a Grey Saucer onto the battlefield. Put this
card into your graveyard.)
Whenever a spaceship you control enters the graveyard, you may return Crash Survivors from
your graveyard to the battlefield tapped under
your control.