yugioh kaiba original starter deck Yu-Gi-Oh KON7KRSD Yugi & Reloaded Decks-Set of 2, Multi : Toys & Games Reloaded Starter Deck Kaiba Starter Deck 1st Edition

Theyre essentially any activated ability that creates mana (like most lands or Llanowar Elves), as long as it isnt a loyalty ability (like on Chandra, Torch of Defiance) or doesnt have a target (like the first ability on Deathrite Shaman

This card was played in pretty much every meta deck at the time

Already this would be bad enough to ignite the MTG community, however, that was just the tip of the iceberg

(Choose a creature with the least toughness among creatures you control and put three +1/+1 counters on it.) Whenever chaos ensues, choose up to one target creature you control and up to one target creature an opponent controls