pokemon cards tapu Koko ex Battle Deck – Pokémon Placeholder Image Provided Tapu Lele (92/191) - SV08

If Archfiend of the Dross somehow loses all of its oil counters due to an effect other than its upkeep triggered ability, this won't cause you to lose the game until the next time that ability resolves

Even more important is that when cast during your first main phase, the card gives you an additional combat phase and untaps all of your creatures when attacking, acting as a form of vigilance but ensuring you can get two full swings in across your two combat phases

This was a fun surprise for me when putting together my binder of S word & Shield Brilliant Stars

Self-mill decks already leverage enchantments like Ripples of Undeath and Cemetery Tampering, so the synergies are there