Forerunners is significantly better than Decimator, being cheaper to cast without having to sacrifice creatures and adding a sweet bonus vigilance to the mix, which means that even if your attack doesn't win you the game you still have blockers to protect against any crackbacks
Blue has some other notables like Moonsnare Prototype (great at enabling Winter Orb), Mnemonic Sphere (Japanese eggs really are the best), and Tezzeret, Betrayer of Flesh, but theyre a little more niche than what weve covered so far
Flavorful and powerful in equal measure, Yuna is quickly cementing herself as a go-to enchantment commander
Free sacrifice outlets are always strong, even type-specific ones, and Nemata lets you pull off dirty tricks like attacking with a board full of Saprolings, then sacrificing the ones that get blocked to pump up the ones that got through for extra damage
You can create powerful chains with him, wherein you play an aura on Chishiro, thus creating a token, then play an aura on the token, creating another, and so on