Muldrotha, the Gravetide + World Shaper + Walk the Aeons + Ashnod's Altar

Muldrotha, the Gravetide

World Shaper

Walk the Aeons

Ashnod's Altar

How it works

1. Activate three Islands by tapping them, adding .
2. Cast Walk the Aeons with buyback by paying 4 and sacrificing three Islands, causing you to take an extra turn after this one and return Walk the Aeons to your hand.
3. Activate Ashnod's Altar by sacrificing World Shaper, adding CC.
4. World Shaper dies, triggering its second ability, returning all land cards from your graveyard to the battlefield tapped.
5. Cast World Shaper from your graveyard by paying 3.
6. World Shaper enters the battlefield, triggering its first ability, allowing you to mill three cards.
7. Repeat each turn.