Backup is another +1/+1 counter mechanic at its foundation, so it naturally fits with the counter support that already exists
Its even a decent win condition, and Ive personally seen players be absolutely blindsided by this for upwards of 25 life
Graf Harvest Grievous Wound Grisly Transformation Ground Seal Gruesome Deformity Gruul War Chant Hammerhand Hand to Hand Havoc Festival Heat Wave Hedonist's Trove Helix Pinnacle Hidden Path Hostile Realm Imposing Visage Incriminating Impetus Intimidation Ironclaw Curse Katabatic Winds Koskun Falls Leshrac's Rite Leyline of Lifeforce Leyline of Punishment Lich Lich's Mastery Madcap Skills Magistrate's Veto Malicious Intent Maniacal Rage Meltstrider's Resolve Mine, Mine, Mine
Each pack contains 15 cards and 1 foil double-sided token, with 1 foil alternate frame rare/mythic (Expedition, showcase, borderless, or extended art), 1 foil rare or mythic, 1 non-foil borderless or showcase rare or mythic, 1 non-foil extended art rare or mythic, 1 foil showcase common/uncommon, 2 non-foil showcase commons/uncommons, 2 foil uncommons, 5 foil commons, and 1 foil full art basic land.
Merfolk is a good one, Wizards can go mono blue (Patron Wizard), loads of combo decks and artifact ramp decks are also fine to be mono blue for
