Bird

187.7. A 1 [M] Bird token is a domainless unit token with 1 Might, the Bird tag, and the Deflect keyword. See rule 809. Deflect for more information.

187.8. A Brush battlefield token is a domainless battlefield token with "Bird, Cat, Dog, Poro, and Ivern units here have +1 [M]" and "When you score here, you may replace this with the battlefield it replaced."

377.2.b. If an Activated Ability has a condition on "using" or "playing" it, that condition must be true in order to activate the ability in question. Example: Ultrasoft Poro reads "[E]: Play two 1 [M] Bird unit tokens with [Deflect]. Use this ability only while I'm at a battlefield." In order to activate the ability, Ultrasoft Poro must be located at a battlefield.

763.1. The following tags exist in Riftbound: Ahri, Akali, Akshan, Ambessa, Anivia, Annie, Aphelios, Ashe, Azir, Bandle City, Bard, Bilgewater, Bird, Blitzcrank, Caitlyn, Cat, Darius, Demacia, Demon, Diana, Dog, Dr. Mundo, Dragon, Draven, Ekko, Elite, Equipment, Evelynn, Ezreal, Fae, Fiora, Fizz, Freljord, Galio, Gangplank, Garen, Heimerdinger, Hwei, Icathia, Illaoi, Ionia, Irelia, Ivern, Ixtal, Janna, Jax, Jayce, Jhin, Jinx, Kai'Sa, Karma, Karthus, Katarina, Kathkan, Kayle, Kayn, Kennen, Kha'Zix, Kog'Maw, LeBlanc, Lee Sin, Leona, Lillia, Lucian, Lux, Malzahar, Master Yi, Mech, Mel, Miss, Fortune, Morgana, Mount Targon, Nami, Nasus, Nidalee, Nilah, Nocturne, Noxus, Ornn, Piltover, Pirate, Poppy, Poro, Pyke, Qiyana, Recruit, Rek'Sai, Rell, Renata Glasc, Renekton, Rengar, Riven, Rumble, Sentinel, Sett, Shadow Isles, Shen, Shurima, Sivir, Sona, Soraka, Spider, Spirit, Swain, Syndra, Taric, Teemo, The Void, Trifarian, Tryndamere, Twisted Fate, Udyr, Vayne, Vex, Vi, Viktor, Volibear, Warwick, Xerath, Xin Zhao, Yasuo, Yone, Yordle, Yuumi, Zaun, Zed, Zilean.