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You must pay all costs for spells cast via Chandra's last two abilities

If your decks strategy is cheating this gigantic creature onto the battlefield as well as other powerful spells with massive mana values, Collect Evidence 10 may become a lot easier to fulfill than it seems if you have other massive spells in your graveyard

Koma, Cosmos Serpent Koma, Cosmos Serpent gives you a steady stream of serpent tokens on each upkeep to activate its sacrifice abilities

Glissa Sunslayer can remove lore counters from any saga

Or you can look at the edges (preferably with some sort of optical magnification)

Force of Will just counters everything in its free variation