Before you can decide what cards should go in your Magic: The Gathering deck, you need to know how many you need to include
The idea is that we can play something like Chainsaw, kill one of our opponent's creatures, draw a card with The Mighty Thor, Jane Foster, and then attack with Mighty Thor to blink the equipment, kill another creature, and draw another card
Whenever a nonwhite creature dies, return it to its owners hand at the beginning of the next end step
Its in every Red-based aggressive deck or any deck that wants to generate value
Legality depends on the tournament format -- Restart Sequence can be legal in some formats and banned or restricted in others
Those benefits might start out small, but they eventually make your critter into a real problem