mtg sonic cards Magic: The Gathering Secret Lair x collaboration announced put a +1/+1 counter on each creature you control with flash or haste Secret Lair x Sonic: Friends

Those bigger things slots appear very flexible depending on who builds the deck, but a lot of the good options are other Wilds cards: Beanstalk Wurm and Blossoming Tortoise for ramp

While I dont know for sure that this is how it works, I would be safe and wait to actually buy your tickets on the 6th or after just to make sure you dont miss out on a promo because of some lame technicality

Lets not forget the minotaur god: Mogis, God of Slaughter, a very solid group slug commander

But while Seedborn Muse may be restricted to green mana decks, it goes above and beyond by affecting all your Permanents as opposed to just Artifacts