#10 Charlotte Katakuri OP03-123 SEC Parallel ($28 / 1,280): The more affordable Katakuri high-rarity variant
If Im wearing my Vintage Hat, Id go with Time Twister as Power, but writing as a Commander fan Ive got to give the final slot on my list to something else

Syr Armont, the Redeemer | Commander | Mark Wischkaemper Commander (1) 1 Syr Armont, the Redeemer Creatures (24) 1 Argothian Enchantress 1 Composer of Spring 1 Dawnhart Geist 1 Destiny Spinner 1 Elvish Archivist 1 Flutterfox 1 Generous Visitor 1 Hero of Iroas 1 Jukai Naturalist 1 Kor Spiritdancer 1 Leafcrown Dryad 1 Mesa Enchantress 1 Nessian Wanderer 1 Qasali Pridemage 1 Regal Bunnicorn 1 Satyr Enchanter 1 Slumbering Keepguard 1 Spellbook Vendor 1 Sram, Senior Edificer 1 Sythis, Harvest's Hand 1 Tanglespan Lookout 1 Timber Paladin 1 Transcendent Envoy 1 Unassuming Sage Sorceries (4) 1 Cultivate 1 Kodama's Reach 1 Return from the Wilds 1 Winds of Rath Enchantments (24) 1 Banishing Light 1 Cast Out 1 Celestial Mantle 1 Chains of Custody 1 Colossification 1 Eldrazi Conscription 1 Epic Proportions 1 Giant Inheritance 1 Grasp of Fate 1 In the Trenches 1 Indrik Umbra 1 Mammoth Umbra 1 Mantle of the Ancients 1 Mythic Proportions 1 Nature's Embrace 1 Oblivion Ring 1 Pollenbright Wings 1 Prodigious Growth 1 Quarantine Field 1 Seal from Existence 1 Shape of the Wiitigo 1 Spectra Ward 1 Verdant Embrace 1 Wurmweaver Coil The point, really, is to think about ramp holistically rather than just "run the most efficient ramp there is"

If damage is prevented this way, you may have Channel Harm deal that much damage to target creature
Ramp, draw, removal, board wipes, counters, tutors, protection, recursion, and graveyard synergy.