Paradox Engine + Urza's Bauble + Emry, Lurker of the Loch + Sol Ring

Paradox Engine

Urza's Bauble

Emry, Lurker of the Loch

Sol Ring

How it works

1. Sacrifice Urza's Bauble targeting any player.
2. Use Emry's ability targeting Urza's Bauble in graveyard.
3. Cast Urza's Bauble.
4. On ETB Paradox Engine triggers, untapping Emry and Sol Ring.
5. Tap Sol Ring for C C.