Cast it on the turn you intend to go off and your opponents will have a hard time stopping you from taking the game
A variety of creature-toolbox decks rely on Chord of Calling as an instant-speed tutor to find silver bullet answers like Reclamation Sage and Collector Ouphe to hamper their opponents, or to assemble value engines with cards like Yawgmoth, Thran Physician
If you have access to 12 mana, which is not terribly rare in a green deck late in the game, you can decimate your opponents
Madam Mim's seven willpower makes her fairly tanky by default, but Sneaky Move cranks up that survivability and throws some offense into the mix
Does a Changeling Count as a Full Party MTG
A Peasant Cube staple, a card that is literally in the Magic Online (MTGO) Vintage Cube, and a card that meaningfully contributes to a range of archetypes for all kinds of Cubes in between, Shriekmaw has long been a favorite of mine