If you do have coven when Redemption Choir enters, then its ability triggers and the trigger goes onto the stack
This is a particularly interesting card, because there are technically two versions of it
Electrostatic Field Pteramander Kaza, Roil Chaser Tezzerets Gambit Octavia, Living Thesis Guttersnipe Deep Analysis Bloodthirsty Adversary Elemental Eruption Curse of the Swine Finale of Revelation Galvanic Iteration Volcanic Torrent Many players may want to keep pingers like Electrostatic Field and Guttersnipe, but to me the whole point of Spellslinger is that you can skip out on playing these sorts of intermediate permanents
Kazuul, Tyrant of the Cliffs is a great way to keep yourself safe when you cant goad your opponents, and it helps to build your board state in several ways
The Flayed One gets added to a long list of 3 mana cards that self-mill, but as an artifact, is better than those other options in this deck that cares about artifacts