Gonti's Aether Heart 
Legendary Artifact
Whenever Gonti's Aether Heart or another artifact you control enters, you get 
(two energy counters).
Pay eight , Exile Gonti's Aether Heart: Take an extra turn after this one.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL