Quote Originally Posted by FTW View Post
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What about 1-of Elixir of Immortality though? Infinite life and infinite mana into 1-of Walking Ballista?
I guess you can go off with UUU and an artifact to discard. With UUU, you can activate AI to find an LED, activate it again to discard the LED, and then activate it a third time so that you can stack the LED activation over the AI activation. When the last AI activation resolves, it puts an aritfact card into hand to continue the chain.

With two artifacts and UU, you can go off by casting the LED from hand.

Fetching, casting, and activating the LED nets +2 mana, and it costs 4 mana to find, cast, and activate the Elixir, so a loop with three LEDs and Elixir nets +2 mana.