mtg more than 60 cards Ikoria Green/blue Mutate - Card Ready to Play Deck - Fun - Magic Top 5 Most Powerful Standard

So in total you will have a set with 260 unique cards

Its an absurdly powerful MTG card, and its integral to any Modern deck that wants to kill an opponent off as quickly as possible or control the board

Yes, Elvish Champion is an elf, which has been updated on all versions from Ninth Edition forward, and appears in the Oracle Text of all versions

Mana Vault Description : Mana Vault is an artifact that taps for three colourless mana, but it comes into play tapped and requires paying four mana during each upkeep or untap step, or else it deals one damage to its controller

You would have to boost this somehow to pump tokens out of it

If the first target of Burn Together is an illegal target as the spell resolves but the last target is still legal, Burn Together will resolve, but no damage will be dealt and nothing will be sacrificed