The Saint Electric

Indestructible
The first 5 times a token enters the battlefield
under your control this turn, untap all
creatures you control.
If you control no creatures, sacrifice The Saint Electric.
Invoke {r}{w}{u}(You may cast this spell for its invoke
cost. If you do, it enters the battlefield as an
enchantment. Destroy it at the beginning of the next
end step. )