Riku ETB Creatures
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Lots of creatures with "enters the battlefield" triggers, which you copy with Riku.
Copy creatures
Double tokens
Mana Acceleration (17):
General (1):
Spells (14):
Sideboard (Omitted/Cut card ideas):
1 Cloud Key
1 Riku of Two Reflections
1 Cloudstone Curio
1 Kozilek, Butcher of Truth
1 Planar Gate
1 Minion Reflector
1 Ulamog, the Ceaseless Hunger
1 Seal of the Guildpact
Creatures (33):
1 Panharmonicon
1 Ulamog, the Infinite Gyre
1 Semblance Anvil
1 Duplicant
1 Paradox Engine
1 Artisan of Kozilek
1 Stone Calendar
1 Prime Speaker Zegana
1 Spitting Image
1 Etherium-Horn Sorcerer
1 Solemn Simulacrum
1 Tishana, Voice of Thunder
1 Temur Ascendancy
1 Conduit of Ruin
1 Animar, Soul of Elements
1 Chancellor of the Spires
1 Clone Legion
1 Paleoloth
1 Farhaven Elf
1 Deadeye Navigator
1 Equilibrium
1 Maelstrom Wanderer
1 Ondu Giant
1 Diluvian Primordial
1 Rite of Replication
1 Dragonlord Atarka
1 Quirion Trailblazer
1 Hoverguard Sweepers
1 Stolen Identity
1 Where Ancients Tread
1 Regal Behemoth
1 Jace's Mindseeker
1 Doubling Season
1 Fable of Wolf and Owl
1 Silverglade Elemental
1 Kapsho Kitefins
1 Parallel Lives
1 Primeval Bounty
1 Ulvenwald Hydra
1 Mulldrifter
1 Flameshadow Conjuring
1 Elemental Bond
1 Wild Wanderer
1 Phyrexian Ingester
1 Warstorm Surge
1 Dual Nature
1 Wood Elves
1 Profaner of the Dead
1 Lifecrafter's Bestiary
1 Yavimaya Dryad
1 Sakashima the Impostor
1 Purphoros, God of the Forge
1 Zendikar Resurgent
1 Scourge of Fleets
1 Onslaught
1 Sphinx of Uthuun
1 Inferno Titan
Lands (35):
1 Tidespout Tyrant
1 Impact Tremors
1 Taiga
1 Avenger of Zendikar
1 Aetherflux Reservoir
1 Tropical Island
1 Brutalizer Exarch
1 Altar of the Brood
1 Volcanic Island
1 Deranged Hermit
1 Oblivion Sower
1 Stomping Ground
1 Eternal Witness
1 Essence Warden
1 Breeding Pool
1 Garruk's Packleader
1 Furious Assault
1 Steam Vents
1 Greenwarden of Murasa
1 Back from the Brink
1 Alchemist's Refuge
1 Hornet Queen
1 Tyrant of Discord
1 Command Tower
1 Primordial Sage
1 Paradise Plume
1 Frontier Bivouac
1 Regal Force
1 Gaea's Cradle
1 Soul of the Harvest
1 Mosswort Bridge
1 Terastodon
1 Path of Ancestry
1 Woodfall Primus
1 Spinerock Knoll
1 Bogardan Hellkite
1 Winding Canyons
1 Chancellor of the Forge
8 Island
1 Combustible Gearhulk
8 Forest
1 Hamletback Goliath
4 Mountain
1 Spawn of Thraxes
1 Sol Ring