You could literally just take the 24 or so highest rated spells according to my archetype breakdown for them and put them with the best land and have a great deck
Durability isn't only about thickness
Though type advantages and weaknesses do play a part in the card game, the cards in the Squirtle & Friends deck outclasses anything in the other two by far
However, after every standby phase, you must pay 100 life points or destroy the card
$0.35 Unsummon 4th Edition $1.29 Angel's Trumpet Urza's Legacy $16.99 Malakir Rebirth Zendikar Rising $1.79 Ice Cauldron Ice Age $6.99 Witch Enchanter Modern Horizons 3 $69.99 Nykthos, Shrine to Nyx Theros $5.99 Flare of Fortitude Modern Horizons 3 $19.99 Sword of Hearth and Home Modern Horizons 2 $23.99 Darkness Legends $20.99 Descent into Avernus Commander Legends: Battle for Baldur's Gate $1.99 Urza's Cave Modern Horizons 3 $9.99 Eiganjo, Seat of the Empire Kamigawa: Neon Dynasty 0 results found
Only use around 3-4 level 5 and 6 monsters, and 1-2 level 7 and up monsters, unless your high-level monsters are readily summonable