Its abilities care about the number of counters it has, so an opponent with proliferate or +1/+1 counter abilities can interact with it to throw off its timing
Dockside Extortionist Dockside Extortionist is arguably another of those Magic card designs folks deem a mistake. Its generous ETB effect creates a Treasure for each artifact and enchantment your opponents control, and its low casting cost means that its easy to bounce and recast over and over
watch out when your opponent plays it
So, for example, Bill the Pony who is, amusingly, a Legendary Creature card costs three Colorless and one White mana to cast
Pitch an Ultimate Green Goblin to Thrill of Possibility, and it's almost like you drew three cards without having to discard anything meaningful
You get free untapping, so that doubles your mana