Hence, the life loss whenever creatures die is very relevant
Megatron, Destructive Force attacks and you sacrifice your Spine of Ish Sah, obliterating your opponent's mana dork and dealing six excess damage to them on top of whatever other combat damage connects, and converting Megatron
That makes it better than any of those effects would be individually
Whenever this creature attacks, other modified creatures you control get +X/+X until end of turn, where X is this creature's power
There is no written, oral, or implied guarantee or representation that the purchaser will receive any specific card
Mechanically, this deck looks like it will be the all-out aggressor at the table, much like the Avengers Assemble deck from Marvel Super Heroes