Originally Posted by
morgan_coke
Their turn: Skip your turn.
Their turn 2: Assume you don't lose.
Your turn: Activate Magosi and rings, get two extra turns. Replay Magosi, untap and activate, skipping your next turn.
Your turn 2: Skip it.
Your turn 3: Activate Magosi and rings, get two extra turns. Replay Magosi, untap and activate, skipping your next turn.
Your turn 4: Skip it.
Your turn 5: Activate Magosi and rings, get two extra turns. Replay Magosi, untap and activate, skipping your next turn.
See how that infinite loop thingy works now?
Garruk + Rings + Magosi. It's a three card combo, one of which is a land, and the other two of which are highly useful on their own. I don't think it fits in the "only good in casual" realm of comboes. Might be more of an extended than a legacy thing though.
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EDIT: A more elegant way to describe what to do, and one that doesn't require you to ever skip a turn from ReoAyanami in the MTGS spoiler thread:
Step 1: Untap with the Magosi, Garruk, Rings and some lands in play. Don't play a land yet.
Step 2: Tap Magosi to add a counter on it and skip your next turn
Step 3: Untap Magosi using Garruk
Step 4: Tap Magosi to gain an extra turn and double it with Rings
Step 5: Play Magosi from your hand.
Step 6: End your turn and start your extra turn.
Step 7: Repeat from Step 1.