They can cast that person's spell with any color of mana
Grove of the Guardian I remember Grove of the Guardian turning the wheels in my head as a new Magic player, especially since it released alongside the populate mechanic from Return to Ravnica
But as the venerable trading card game enters its next original expansionon the precipice on its next, controversial step into the games crossover-laden futureit wants to bring you back not just to the familiar realm of Tarkir, but to the basics
1 Imposter Mech
Force of Savagery I mean, maybe youre running a deck that cares about creature deaths and are happy to summon something for just to have it die immediately
With cards like [c]Heritage Druid[/c], [c]Nettle Sentinel[/c], and [c]Priest of Titania[/c], you can generate loads of mana in a single turn, drawing cards after every creature you play thanks to Glimpse of Nature, and then playing the cards you draw as well