mtg card all will be one Whenever an opponent attacks you with two or more creatures All Will Be One Magic

I stipulated blue in the title, this was merely so I didn't have to work out where Mana Tithe fits into the mix and spend a lot of convoluted time discussing the implications of a functional reprint in a different colour

These all offer nice fixing, and the lifegain on the BW can be extra nice.

In total, there are 25 different cards with backup, and one card that names the keyword without actually having it

Legendary Creature Human Wizard Knight When Celes enters, discard any number of cards, then draw that many cards plus one

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For each of those cards, pay 4 life or put the card on top of your library. Effectively, its a bit like Brainstorm, but on every turn