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The Halfbricks (RW) Mechanic: To Arms

Lim-Dul the Necromancer, Massacre Wurm, and the hidden gem Sangromancer give you benefits from creatures dying

For the sake of simplicity, lets call all of these cards "cyclers" (that all can be cycled), and my selections meet the criteria of either a) costing a single mana to discard, b) providing additional value when cycled, or c) ideally both: Greater TanukiGreater Tanuki, Altanak, the Thrice-CalledAltanak, the Thrice-Called, and Shefet MonitorShefet Monitor serve as ramp sources, while Generous EntGenerous Ent, Eagles of the NorthEagles of the North, and Spinewoods ArmadilloSpinewoods Armadillo can help with hitting land drops

The first one gives you a one-time army in a can usually via enters the battlefield effects from creatures like Avenger of Zendikar and Hornet Queen