A card usually earns that status by being a power benchmark, the first clear example of an effect, a tournament-defining staple, or a card everyone references in conversation
So, let's break down the best options for Standard, Modern, and Commander, with some deck lists thrown in for good measure
In lower-power Brackets, Game Changers and infinite combos are nonexistent while in higher-power Brackets, theyre often part of how games end
1 Wild Growth
MtG Conspiracy Rare Worldknit #13 Company: Wizards of the Coast Series: Conspiracy Item Type: Single Card Brand: Magic The Gathering Release Date: June 6, 2014 UPC: 0609411436981 Stock #: 87570 Our Guarantees to You, Our Valued Customer
2 Legends The typical drawback of legendary creatures (you can only control one of each at a time) is irrelevant in Commander, where only one copy of each card is allowed anyway