Elf decks already have Priest of Titania, but other go-wide builds that arent Elf tribal will be interested in this, especially if they dont go tall enough for Selvala, Heart of the Wilds
In other words, Marwyn turns every Elf you play into both a permanent buff and a source of future mana
Creatures your opponents control can be the targets of spells and abilities as though they didn't have hexproof
As the name suggests, you should start here and not worry about anything else until you know whether you enjoy and want to get more serious about playing the game or collecting the cards
Red can choke greedy mana bases, create explosive turns, copy powerful creatures, and even use the graveyard as fuel
It works in a number of combo and recursive shells, and you can now get foil ones for your deck as well as a new generation of players getting access to this card outside of the singles market