Swift Warden has always been a card Ive been interested in, but the Merfolk have generally been all about the tap-out decks, whereas Swift Warden is a flash/tempo card
Lets loop back to advice about deckbuilding now
Aang, Master of All Elements is a Fist of Suns on a stick, but it does even more
Legendary Creature - Elf Noble Colossal Whale Islandwalk (This creature can't be blocked as long as defending player controls an Island.) Whenever this creature attacks, you may exile target creature defending player controls until this creature leaves the battlefield
I love Disney Villainous and have loved it long before Lorcana was a thing, so I was pretty excited to see it featured in the Shimmering Skies Lorecast
Phyrexian Devourer Why would you want to eat your library in order to make one really big creature that you have to sacrifice when its power is 7 or greater