-1/-1 counters decrease a creature, so you usually use them on your opponents' creatures
Take a look: Commander (1) Creature (37) Universal Automaton Mothdust Changeling Changeling Outcast Impostor of the Sixth Pride Unsettled Mariner Amoeboid Changeling Shapesharer Skeletal Changeling Magda, Brazen Outlaw Cloudshredder Sliver Guardian Gladewalker Harabaz Druid Manaweft Sliver Masked Vandal Three Tree Mascot Bloodline Pretender Mirror Entity Sylvia Brightspear Knight Exemplar Master of the Pearl Trident Yuriko, the Tiger's Shadow Haakon, Stromgald Scourge Taurean Mauler Feline Sovereign Realmwalker Risen Reef Irregular Cohort Murmuration Sliver Overlord The First Sliver Higure, the Still Wind Unesh, Criosphinx Sovereign Hellkite Courser Morophon, the Boundless Valiant Changeling Reaper King Spawning Kraken Instant (5) Stinging Study Entomb Wings of Velis Vel Blades of Velis Vel Crib Swap Sorcery (9) Cateran Summons Wargate Buried Alive Notorious Throng Peer Pressure Widespread Brutality Jarad's Orders Coveted Prize Bring to Light Enchantment (5) Curse of Opulence The Bears of Littjara Battle of Frost and Fire Liliana's Contract Rooftop Storm Artifact (6) Sol Ring Arcane Signet Fellwar Stone Chromatic Lantern Dragon's Hoard Maskwood Nexus Land (37) Ally Encampment Ancient Amphitheater Auntie's Hovel Brotherhood Headquarters Bucolic Ranch Bountiful Landscape City of Brass Command Tower Deceptive Landscape Exotic Orchard Flamekin Village Foreboding Landscape Forest x2 Fortified Beachhead Gilt-Leaf Palace Haven of the Spirit Dragon Island x2 Mountain x2 Murmuring Bosk Mutavault Overgrown Tomb Path of Ancestry Perilous Landscape Plains x2 Primal Beyond Reflecting Pool Sacred Foundry Secluded Glen Shattered Landscape Swamp x2 Swarmyard The World Tree This deck has some of the combos I already covered plus combo enablers like Reaper King, but the interesting part is that the commander, The Ur-Dragon, isnt a changeling
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0: Discard all the cards in your hand, then draw that many cards plus one
If your commander dies, you can pay life instead of commander tax, so recasting it isnt a big deal
