Yenna, Redtooth Regent + Nature's Chosen + Phantatog

Yenna, Redtooth Regent

Nature's Chosen

Phantatog

How it works

1. Activate the mana-producing permanent by tapping it, adding at least 2.
2. Activate Yenna by paying 2 and tapping it, creating a token copy of Nature's Chosen attached to Yenna, untapping Yenna, and scrying 2.
3. Activate the Nature's Chosen token's second ability by tapping Yenna, untapping the mana-producing permanent.
4. Activate the Nature's Chosen token's first ability by paying 0, untapping Yenna.
5. Activate Phantatog's first ability by sacrificing the Nature's Chosen token, causing Phantatog to get +1/+1 until end of turn.
6. Repeat any number of times.
7. If the mana-producing permanent can produce at least 3, this combo produces infinite mana that artifacts, creatures, and lands you control can produce.

This fascinating loop turns Yenna, Redtooth Regent into an enchantment-copying engine by enchanting her with Nature's Chosen, whose ability to untap Yenna is repeatedly triggered whenever a fresh token copy hits the board. Because Nature's Chosen is an Aura, Yenna's copying ability conveniently untaps herself upon creation, letting you use the token's tap ability to untap your mana source and its {0} ability to untap Yenna right back. Finally, Phantatog acts as the perfect outlet for this recursion, letting you sacrifice the extra token copies to pump its stats while you continuously rebuild the loop.