infinite turns fairly quickly

, : Put a charge counter on this artifact. , Remove three charge counters from this artifact: Take an extra turn after this one.

: Put a charge counter on target artifact. Sacrifice this creature: Put two charge counters on target artifact.

Imprint — Whenever a nontoken creature dies, you may exile that card. If you do, return each other card exiled with this artifact to its owner's graveyard. , : Create a token that's a copy of a card exiled with this artifact. It gains haste. Exile it at the beginning of the next end step.