A starting build might look something like this: Creatures (22) 4 Crystalline Sliver 4 Muscle Sliver 2 Plated Sliver 4 Sinew Sliver 4 Predatory Sliver 4 Galerider Sliver Lands (22) Spells (16) Your big advantages over Merfolk are a better type of evasion Flying works against everybody, pretty much and Crystalline Sliver
Still, there may be a few decks that will take even bad Seedborn Muse: perhaps Kruphix, God of Horizons or Rashmi, Eternities Crafter
The idea here is that you would keep gaining more mana, and if you couldn't pay it, you would keep taking more damage
20 SNAPCASTER MAGE Blue, more than any other color, relies on casting Instants and Sorceries
5 | Norin, Swift Survivalist Mana Value: R Rarity: Uncommon Stats: 2/1 Card Text: Norin, Swift Survivalist cant block