Some creatures appear only for a moment, their power unleashed before they vanish back into the mists.
Evoke
Evoke is an evergreen that works when the respective creature card is exiled from the hand with full mana. When using the Evoke evergreen, all of the card’s “When this creature enters the battlefield” and “When this creature leaves the battlefield” abilities trigger. After all effects are resolved, the card is put in the graveyard instead of the exile.
Note that this effect doesn’t make the creature actually enter the battlefield. On one hand, only that card’s effects will trigger; that is, other creatures on the battlefield will not acknowledge this friend entering. On the other hand, you can use Evoke without having to replace a creature if you already have a full battlefield!
