When you WANT to put -1/-1 counters on all your creatures. : r/custommagic
Chimera Commander Comprehensives: +1/+1 Counters Part 1
Amazon.com: Citadel Black MTG Buff Counters +1/+1 and -1/-1 Set of 20 Metal Tokens - with Velvet Drawstring Pouch, Antique Silver Finish Metal Tokens, Magic: The Gathering, Gray : Toys & Games