When your opponent activate a monster effect, you can discard "1 monster with "Kuriboh" in its name or 1 "Kuriboh" monster"
Before it's ban it was a highly effective tool in high-powered and cEDH decks that often represented too great a mana advantage to be fair at more casual tables
It essentially converts extra draws into +1/+1 counters, which answers the age-old question: I've drawn a ton of cards, now how do I win? The cantripping nature of this blue enchantment also means it's never a dead card, even if you're not completely going off with it
Aura/equipment decks can benefit from some of the robots above like Codsworth, Handy Helper
(with tracking number)*Delivery to some areas may take up to 30 business days.Express shipping : 2- 5 business days
For a more detailed history of the Council of Colors, here's my last article on it