Cards like Marwyn, the Nurturer, Pelt Collector, and Allosaurus Shepherd can use +1/+1 counters to buff themselves with keywords, add extra mana, and massively increase the power of all your Elves
These include A Game of thrones, Arkham Horror, Battlestar Galactica, Chaos In The Old World, Cosmic Encounters, Descent, Doom Board Game, Galaxy Trucker, Game of Thrones CCG, Gears of War, Mansions of Madness, Mission: Red Planet, Runebound, Space Hulk, Star Wars: Imperial Assault, Starcraft The Board Game, Tide of Iron, Times Up and World of Warcraft: The Board Game
Likewise, Witchs Clinic puts lifelink into your mana base for a super-reasonable investment
If either you or your opponent resolves a card that says you become the monarch, they immediately become monarch
"Mystical Space Typhoon", "Heavy Storm") is activated to destroy such a Trap Monster, cards that only activate in response to effects that would destroy Trap Cards can be activated, but effects that only activate in response to effects that destroy monsters cannot