Boros Garrison [Guilds of Ravnica Guild Kit] 045 and a multicolored card can

and a multicolored card can be any of its colors

Set: Jungle 1st Edition Type: Colorless Rarity: Holo Rare

return it to the battlefield under its owner's control

how would I know it worked

Set: Phyrexia: All Will Be One Promos Type: Creature — Phyrexian Cleric Rarity: Uncommon Cost: {G}{W} Toxic 2 (Players dealt combat damage by this creature also get two poison counters

Boros Garrison [Guilds of Ravnica Guild Kit] 045 and a multicolored card canSet: Guilds of Ravnica Guild Kit Type: Land Rarity: Common Boros Garrison enters the battlefield tapped. When Boros Garrison enters the battlefield, return a land you control to its owner's hand. {T}: Add {R}{W}.