That list looks terrifying with this
Enemy-color multicolor cards would eventually get made, but always in a quantity lower than ally colors and at a lower power level (enemy-color cards were often weaker than ally-color cards)
But it's so cheap at 5 mana, and already a 5/5 creature, so even after mass removal sweeps the board, Uril hits fast and hard
Kaalia pilots want to get their commander on the battlefield quickly (using mana rocks, fast mana, and rituals), protect her from opposing removal (using cards like Lightning GreavesLightning Greaves and Not Dead After AllNot Dead After All), and then cruise to an easy victory with a board full of monsters
In this case, however, one key card makes Pikachu ex decks a lot more efficient