Let me address the second one first
It used Gran-Gran and Artist's Talent to reduce the cost of spells and discard cards, Monument to Endurance to deal damage to opponents and draw additional cards as cards got discarded, and a variety of Lessons for their interactions and card draw
Creature Artifact - Construct Color tag templates(None) Halvar, God of Battle Creatures you control that are enchanted or equipped have double strike
It hits hard, is easy to crew, draws you cards when your Pirates deal damage, and can even rise from the depths if it takes too many broadsides, provided you have some tapped Pirates lying around
This is especially true if it has a tap ability or some type of attack trigger
In this case, given that the crossover revolves around the Evil Dead IP, there are lots of cool references to the horror film franchise