Camouflage grants hexproof and helps it grow quickly, and attacking doubles counters on your legendary and spider creatures
Other cards you could add are Thassa's Oracle, Bident of Thassa, Retreat to Coralhelm, maybe High Tide, Tidal Influence, Tidal Surge, Tidal Wave, or high-toughness Crabs like Ancient Crab to hold the fort while you mill
This has tied life gain to card draw in a few different ways
Set-specific crossover products
After consulting with the story team, it was decided that Vryn was more white-blue and that Ravnica being the home of all ten two-color pairs allowed it to have any combination
This will almost always draw at least one card if you mutate after blocks, and will usually draw several over a few turns, often winning you the game