What I like about Imoti, Celebrant of Bounty is that it opens up weird cascade effects with giant stupid cards like Terastodon, Hullbreaker Horror, and Soul of the Harvest
The flashback is cheaper if you have an expensive commander, too
Sure, that's a big ol' hit to you, but that flexibility is why it's hitting my chart here but the first one
Just think of Grunn, the Lonely King attacking alone with Rafiq on the battlefield: Grunn doubles its power and toughness, gets any exalted triggers, and then gains double strike to smash in for over twenty points of damage
This ties into Magics Adventure mechanic, with some new rules to add extra wrinkles
The former requires a mass haste enabler and a 1 mana value flicker spell like Cloudshift or Essence Flux, letting you cycle through your deck as you continually use Garths Black Lotus and Regrowth effects to play your flicker spell