It is the same kind of annoyance you face when building with cards like Doom Blade that fail to kill black creatures
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If the Elemental that caused Champion of the Path's second ability to trigger is no longer on the battlefield when that ability resolves, use that Elemental's power as it last existed on the battlefield to determine how much damage is dealt

Doc Aurlock Un-Bear-Able Fun Doc Aurlock, Grizzled Genius | Illustration by Jesper Ejsing Commander (1) Planeswalker (1) Creatures (31) Aerial Caravan Alaundo the Seer Archmage's Newt Augury Raven Avian Oddity Battle Mammoth Beanstalk Giant Beanstalk Wurm Beastbond Outcaster Durnan of the Yawning Portal Elusive Otter Fblthp, Lost on the Range Gale, Waterdeep Prodigy Grolnok, the Omnivore Kellan, Inquisitive Prodigy Lier, Disciple of the Drowned Marang River Prowler Outcaster Trailblazer Outlaw Stitcher Patrician Geist Railway Brawler Rootcoil Creeper Rosethorn Acolyte Sage of the Beyond Savvy Trader Skaab Ruinator Slickshot Lockpicker Snapcaster Mage The Foretold Soldier Tlincalli Hunter Visage Bandit Sorceries (17) Aminatou's Augury Bygone Marvels Creeping Renaissance Croaking Counterpart Echo of Eons Lock and Load Make Your Own Luck Mind's Desire Mnemonic Deluge Plan the Heist Quiet Speculation Rise of the Varmints Spectral Deluge Spitting Image Step Between Worlds Tumbleweed Rising Winterthorn Blessing Instants (7) Barrier Breach Behold the Multiverse Cackling Counterpart Choking Tethers Countervailing Winds Oona's Grace Surge of Brilliance Artifacts (2) Abandoned Sarcophagus Sword of Forge and Frontier Enchantments (3) Extraordinary Journey Secrets of the Dead Virtue of Strength Lands (38) Alchemist's Refuge Barkchannel Pathway Botanical Sanctum Castle Garenbrig Castle Vantress Command Tower Dreamroot Cascade Exotic Orchard Forest x12 Hedge Maze Island x12 Myriad Landscape Rejuvenating Springs Simic Growth Chamber Temple of Mystery Terramorphic Expanse The cards that Doc Aurlock, Grizzled Genius prescribes are more varied than you think

I love doing something in the game where I can just sit back and say, "Man, that was cool!" The game I am about to talk about had one such moment