This is a four-color +1/+1 counters deck. It stacks counter amplifiers like add-one and doubling effects, then spreads counters wide through proliferate, doubling and mass-counter enchantments, and turns the counters into evasion, mana and cards. Ishai grows from opponents' spells, and Reyhan recycles counters: whenever a creature with counters dies or goes to the command zone, Reyhan can move that many counters onto any target creature, so removal and board wipes don't erase the investment. Hamza and the counter-matters mana creatures let the board snowball into an overwhelming army. How it wins: It overwhelms opponents with huge flying, trampling or unblockable counter-laden creatures, or it assembles the Crystalline Crawler and Simic Ascendancy loop with two amplifiers for infinite counters, infinite mana and a Simic Ascendancy win on the next upkeep. Key roles: - Counter amplifiers: Add-one and doubling replacement effects multiply every counter placed, which makes every other piece explosive and enables the infinite loop. (Hardened Scales, Branching Evolution, Corpsejack Menace) - Mass counter spreading and multiplying: Per-turn and per-creature effects, proliferate and doubling put counters on the whole board and grow them exponentially. (Cathars' Crusade, Kalonian Hydra, Atraxa, Praetors' Voice) - Counters into mana: Creatures carrying counters tap for mana, or scale their output with counters, which fuels the curve and the Crawler combo. (Crystalline Crawler, Kami of Whispered Hopes, Rishkar, Peema Renegade) - Counters into cards: Creatures and enchantments draw cards whenever counters land on them or countered creatures connect, which keeps the hand full. (Fathom Mage, Bred for the Hunt, Inspiring Call) - Evasion anthems: Static effects give every countered creature flying, trample or unblockability, which turns the wide board into lethal damage. (Abzan Falconer, Herald of Secret Streams, Tuskguard Captain) - Counter preservation and one-sided sweepers: Reyhan and similar death triggers reclaim counters from dying creatures, which pairs with sweepers that spare the deck's own countered threats. (Reluctant Role Model, Felisa, Fang of Silverquill, Wave Goodbye)

Ishai, Ojutai Dragonspeaker & Reyhan, Last of the Abzan decklist

• Abzan Falconer
• Ajani, the Greathearted
• Arcane Sanctum
• Arcane Signet
• Assassin's Trophy
• Atraxa, Praetors' Voice
• Azorius Chancery
• Beast Within
• Birds of Paradise
• Branching Evolution
• Brave the Sands
• Bred for the Hunt
• Brokers Ascendancy
• Cathars' Crusade
• Champion of Lambholt
• Chromatic Lantern
• Command Tower
• Conclave Mentor
• Corpsejack Menace
• Counterspell
• Crystalline Crawler
• Cultivate
• Darkwater Catacombs
• Dazzling Denial
• Deepglow Skate
• Duneblast
• Evolution Sage
• Evolution Witness
• Evolving Wilds
• Exotic Orchard
• Farseek
• Fathom Mage
• Felisa, Fang of Silverquill
• Fellwar Stone
• 6× Forest
• Forgotten Ancient
• Golgari Rot Farm
• Gyre Sage
• Hamza, Guardian of Arashin
• Hardened Scales
• Herald of Secret Streams
• Incubation Druid
• Inspiring Call
• 4× Island
• Jiang Yanggu, Wildcrafter
• Kalonian Hydra
• Kami of Whispered Hopes
• Karn's Bastion
• Kutzil, Malamet Exemplar
• Lae'zel, Vlaakith's Champion
• Managorger Hydra
• Master Biomancer
• Master Chef
• Mutational Advantage
• Mystic Remora
• Opulent Palace
• Ozolith, the Shattered Spire
• Path to Exile
• Pir, Imaginative Rascal
• 4× Plains
• Rampant Growth
• Reliquary Tower
• Reluctant Role Model
• Revitalizing Repast
• Rishkar, Peema Renegade
• Sandsteppe Citadel
• Scavenging Ooze
• Seaside Citadel
• Simic Ascendancy
• Sol Ring
• Solidarity of Heroes
• Sungrass Prairie
• 4× Swamp
• Swiftfoot Boots
• Swords to Plowshares
• Terramorphic Expanse
• Thrummingbird
• Toothy, Imaginary Friend
• Tuskguard Captain
• Vivid Creek
• Vivid Grove
• Vivid Marsh
• Vivid Meadow
• Vorel of the Hull Clade
• Wave Goodbye
• Winding Constrictor