Both have trample, which works great if you mutate either onto the deathtouching Mire Triton, and Gemrazer can mutate onto Stonecoil Serpent to inherit Serpents counters
Ponder is one of the best "cantrips" in the game
Primeval Titan (a mythic) is barely above the pack price as is, given its three previous printings
With All Tied Up, Gustav The Giant, Terror of the Kingdom enters play exerted and cannot be readied up at the start of the players turn, meaning that the character is initially useless
You may well have to pick some things you don't want to and likely over things you did want and then shoehorn these random life gain things into your deck that you otherwise don't need or have better options you would rather have in the slot
But this legendary creature is a ninjutsu Commander at heart, powering your Ninjas so you can get easy triggers each turn