+1/+1 counter archetypes are extremely popular in these colors, and both Wave Goodbye and Tributary Instructor should be immediate inclusions for the majority of those decks
The first cards the mechanic appeared on were Frodo, Sauron's Bane, Samwise the Stouthearted, and Gollum, Patient Plotter
this Leafeon ex is no delicate leaf
Sometimes we've had great applications of it, like in Modern Horizons 2 and Commander Legends, and other times it's been hard to notice, like in Strixhaven's Mystical Archive
This is actually surprisingly easy if you employ a few type-changing tricks again
13.3 If the Seller sells a Lot that was unsold at the Sale: (a) within 90 days after the Sale to a person who was registered to bid at the Sale