If you cast a creature spell without paying its mana cost but you paid mana for additional costs or cost increases (such as from Aven Interrupter), Satoru's last ability won't trigger
Since Goddric, Cloaked Reveler has haste, it may count itself for the Celebration effect's requirement, which is vital since this Celebration effect is based on attacking
Stitch is also tagged with Floodborn, Hero and Alien
We don't yet know how many Room cards Duskmourn will provide, but we've already seen artwork and names for plenty, with Grand Entryway/Elegant Rotunda, Dollmaker's Shop/Porcelain Gallery, Painter's Studio/Defaced Gallery, and Moldering Gym/Weight Room all teased
Evolving Wilds
If there is any Geralfs Messenger on the field, you may choose to copy it