The trouble with X spells like this is that big EDH mana, especially in red, tends to come in Treasures or in burst effects like Irencrag Feat or so many combos with Basalt Monolith
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The most important keywords in this format are flash, haste, indestructible, and then hexproof followed by some form of evasion
Gogo, Master of MimicryGogo, Master of Mimicry Gogo, Master of MimicryGogo, Master of Mimicry's ability to copy activated or triggered abilities you control X times is exactly the sort of thing combo fans are going to be thrilled to explore when building their Gogo decks
Mathemagics would primarily benefit a blue-based ramp or combo deck that can generate large amounts of mana (especially via mana doublers like **High Tide**, **Mana Flare** effects in multiplayer, or artifact ramp such as **Sol Ring**, **Mana Crypt**, and **Grim Monolith**) and is aiming to win in the same turn it casts this spell, since XXUU becomes extremely powerful once X reaches 4 or higher (drawing 16+ cards)
Hitting both your opponent's field and their Life cards in a single turn is sure to put them under significant pressure