Pokemon company should really hire him to replace some of their current artists and continue to release new like Lugia, Darkrai, etc
Elves' main trait is generating a lot of mana and flooding the battlefield, both of which enable Marwyn's ability to give it massive stats and generate a ton of mana
Ferocity of the Wilds is a unassuming little enchantment, but it truly shines in stompy tribal decks like Giants
Being able to Gift the player at the table with the weakest board position an extra turn to enable you to advance you battlefield presence through your own extra turn could be quite nice
As the match progresses, though, this becomes a weaker option but can be used to give your other Grass-type strategies a bit more sting
This is another rule that follows if the card doesnt say you can, then you cant. But there are a handful of cards that explicitly return other cards from exile