It gives you an upfront threat and helps start or progress your zombie army, something blue cares about when paired with black, red, (the two Amass colors) and green (the other Proliferate color)
For the Amethyst characters, abilities like Evasive are crucial to slipping through and either scoring tricky points or sliding through for damage (without much fear of retaliation)
Were likely to hear more from Wizards in the next day or so regarding the drops, so if the cards above caught your interest, keep your eyes peeled
Goofy's ability "And Two For Tea!" is also extremely beneficial because once he is played, the player can remove up to 2 damage from each of their musketeer cards
And then The Scarab God can exile a bunch of opposing creatures over time, thus providing gentle removal and pushback against the huge graveyard abuse that's common in the kitchen table metagame, all while giving you a powerful 4/4 body