In general, Planeswalkers and other noncreature threats tend to be good sideboard cards against slow decks
Malevolent Rumble You only get one shot at ramp with Malevolent Rumble, but that's really all you need
Im actually rather surprised and disappointed by the number of key enablers being printed into Ikoria but have not been included in this list
This 2 colorless, one red mana Sorcery card forces all players to discard their hands and draw seven new cards
Cerberus Final Fantasy $0.49 Coliseum Behemoth Final Fantasy $0.79 Firion, Wild Rose Warrior Final Fantasy $0.49 Tidus, Blitzball Star Final Fantasy $0.49 Reach the Horizon Final Fantasy $0.49 Ride the Shoopuf Final Fantasy $0.49 Seifer Almasy Final Fantasy 0 results found
Since there are a lot of different pieces that need to get into play at once and we want the combo to come out of nowhere, it makes the most sense to me to go another direction with this deck: Green for Collected Company