Alternatively, use a service like MTG Print to print your proxy cards on your home printer
MTG: Arena does a really great job of not only making itself accessible by having a really great tutorial sequence and giving you a great starting collection for free, but it has an amazing setup for earning rewards and giving you reason to explore every inch of the games different formats and styles of play including most notably competitive play
Once per turn, during the Standby Phase: Target 1 "Archfiend" monster on the field
Finally, colorless cards, such as some artifacts, do not have any colored mana requirements but still require a general amount of mana to be spent to play
But Sylvan Scrying only costs 2, perhaps because lands are typically less impactful than other types of spells
(Which means I'll be flogging the spares off here later so give my account a follow)