until the third season, when a Yubel-possessed Marcel forcibly unseals and uses them
(7/1/2013) If Grimgrin's last ability resolves, but the targeted creature isn't destroyed (perhaps because it regenerated or has indestructible), you'll still put a +1/+1 on Grimgrin.
And then if we had some way to repeatedly bring back Fossil Find, we could up the ante again by doing 2^^^(2^^^(2^^^(...))), or roughly 2^^^^X
Like the manga, it will drain your life essence, or in this case, life points by 1000 during each of your Standby Phases
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This leaves you free to use the graveyard however you like, while your opponent is completely locked out of theirs