As a noun, it is identical in both the singular and plural, as is every individual species name
We are returning to the plane of Arcavios to see how the five colleges have fared since the Phyrexian Invasion, and early leaks suggest this set is going to be great for both Standard and Commander players
Orfeo, the Boulder Rakdos and Bant: Shagrat, Loot Bearer and Galea, Kindler of Hope Gruul and Esper: Meria, Scholar of Antiquity and Arna Kennerd, Skycaptain Selesnya and Grixis: Danitha, New Benalias Light and Tetsuo, Imperial Champion Orzhov and Temur: Ria Ivor, Bane of Bladehold and Pako, Arcane Retriever & Haldan, Avid Arcanist
Its more of an unspoken agreement, and you may find that if you step over it in a casual game, itll be considered a faux pas
Youll usually either end up restricting the mana of your opponents or very quickly building up so many tokens that everyone will give up on trying to stop you, and then you can crush them like the manaless bugs that they are