Playing elves, giving their creatures -1/-1 counters, and using your own elves to proliferate is very solid
Mandible Justiciar Mask of Griselbrand Mechtitan Core Mukotai Ambusher Multiclass Baldric Multiform Wonder Nezumi Prowler Oildeep Gearhulk Orzhov Keyrune Osseous Sticktwister Paladin Danse, Steel Maverick Phyrexian Fleshgorger Poet's Quill Prakhata Pillar-Bug Quick-Stick Lick Trick Ratchet, Field Medic Ratchet, Rescue Racer Resurrection Orb Riddle Gate Gargoyle Scavenged Brawler Scion of Draco Shadowspear Shadowspear Sphinx of the Revelation Sphinx of the Steel Wind Steel Seraph Super-Adaptoid T-45 Power Armor The Wind Crystal Valor's Flagship Vault Skirge Venomcrawler Wedding Invitation Whip of Erebos Windwright Mage Wurmcoil Engine Wurmcoil Larva
Sure, your Consecrated Sphinx is good to resolve, but before my turn, for the price of one blue mana and an expendable creature, let me get my own straight to the field with Mask of the Mimic as well
This is good stuff to its most detrimental degree, though its undeniably powerful
And the upside's actually pretty good for a dinky little common like this