Well do this by comparing how much mana is spent for each card netted
(When this Equipment enters the battlefield, create a 2/2 red Rebel creature token, then attach this to it.) Whenever Blade of Shared Souls becomes attached to a creature, for as long as Blade of Shared Souls remains attached to it, you may have that creature become a copy of another target creature you control
Granted, you have to cast it multiple times, but with enough tokens, you can cast this green instant for free multiple times a turn
Three is quite a lot just for card quality and won't bail you out of savage mana screws however it is typically played in more long term decks which are far less likely to keep land light hands
Rakdos Joins Up If you have a Kroxa in your yard this is basically 5 mana, deal 11 damage to your opponent
As the card with fuse goes onto the stack, it wont stack both effects individually