That means they have green mana symbols somewhere on the card, whether in the casting cost, rules text, or both, but they contain no other colored mana symbols
I've recently started playing Magic the Gathering: Area more than any other game I have in my library
I won't keep you in suspense on these: none of them worked out
For instance, this five-mana Angel offers up a kicker cost that can destroy all lands in play
Advanced Search Sets Random Syntax Abuelo's Awakening Against All Odds Altar of Bhaal Altar of Bhaal Altar of the Wretched Archaeomender Argivian Archaeologist Argivian Find Argivian Restoration Artificer's Dragon Auriok Salvagers Ayara, Furnace Queen Bag of Holding Blood Fountain Brilliance Unleashed Bringer of the White Dawn Broodheart Engine Buried Ruin Call Damage Control Campus Renovation Carrion Cruiser Cavalier of Dawn Chronomancer Clay-Fired Bricks Codex Shredder Coin of Fate Crawling Filth Crystal Dragon Crystal Dragon Custodi Squire Damage Control Crew Daretti, Rocketeer Engineer Daretti, Scrap Savant Daring Archaeologist Dawn-Blessed Pennant Dee Kay, Finder of the Lost Dire Flail Dogmeat, Ever Loyal Dr