Oblivion, God of Eternity

Flying, deathtouch, trample, double strike, indestructible, unblockable, haste, flash.

This card is not a creature unless you control five or more dragon gods. This card also doesn't become indestructible until it becomes a creature.
Until Oblivion becomes a creature—{t}:for {x} mana where {x} is total toughness of dragons on the battlefield

{b}{b}{4}{t}: search your library, hand and graveyard for a permanent card and play it without paying its mana cost, then shuffle your library.