Ever since, we've had cards that want you to sacrifice for various effects (from Gate to Phyrexia all the way to Smothering Abomination)
Letting your opponents loot can be detrimental, but cards like Orcish Bowmasters or Faerie Mastermind can wring some value from the forced draw
Its a 3/3 that grants Riggers +1 attack haste, and then it lets Riggers assemble an additional Contraption whenever an ability or effect causes Riggers to make Contraptions
Anytime any creature dies, yours or your opponents, you get to drain two life from an opponent and heal yourself two, putting some heavy pressure on your opponents
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A field of 20 cards isn't much, but within those cards are some standout examples of how this mechanic can take over a game