Activate Sol Ring by tapping it, adding {C}{C}.
Cast Shriekhorn by paying {1}.
Tidespout Tyrant triggers, returning Sol Ring from the battlefield to your hand.
Activate Shriekhorn by tapping and removing a charge counter from it, causing target player to mill two cards.
Cast Sol Ring by paying {1}.
Tidespout Tyrant triggers, returning Shriekhorn from the battlefield to your hand.
Repeat.

Infinite mill

Infinite self-mill

Infinite storm count

Tidespout Tyrant

Shriekhorn

Sol Ring

Activate Mana Vault by tapping it, adding {C}{C}{C}.
Cast Shriekhorn by paying {1}.
Tidespout Tyrant triggers, returning Mana Vault from the battlefield to your hand.
Activate Shriekhorn by tapping and removing a charge counter from it, causing target player to mill two cards.
Cast Mana Vault by paying {1}.
Tidespout Tyrant triggers, returning Shriekhorn from the battlefield to your hand.
Repeat.

Combos with "Shriekhorn"