All of these are free to use, and you can track down the art and edit them however you like, JUST dont be a douche and use cards you dont own (unless its for a cube perhaps) and please keep artist accreditation (Jeremy Carver)
As with Soul Foundry, the climate was right to push cards with weird and wacky rules interactions
Legality depends on the tournament format -- Serra Avenger can be legal in some formats and banned or restricted in others
It costs very littlein fact, the perfect amount for Dark Ritualand lets you see as many cards as you have life to pay
Not only does it give you a way to chip in for damage, but Red and especially Blue/Red has a boat load of payoffs for sacrificing artifacts too, and this will feel like an engine in that type of deck
Before this set we had 40 cards that could Proliferate, now there will be 74