mtg split cards play both Top 10 Spells (Excluding Fused Cards) in Magic: The Gathering Split card - MTG Wiki

Banner of Kinship Banner of Kinship can provide Coat of Arms levels of board pump, sometimes enough to end the game on the spot, but it also has the failcase of being a complete blank if you have no creatures in play already

Two-Card Death Combos MTG x TMNT introduced a lot of new cards that care about an opponent losing half of something

You get the colors you need from it right away, but it still has a downside by forcing you to use that mana between your untap step and combat step

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