Katilda's power and toughness are each equal to the number of permanents you control that are Spirits and/or enchantments.
Disturb (You may cast this card from your graveyard transformed for its disturb cost.)
Enchant creature
Enchanted creature has flying, lifelink, and protection from Vampires, and it gets +X/+X, where X is the number of permanents you control that are Spirits and/or enchantments.
If Katilda's Rising Dawn would be put into a graveyard from anywhere, exile it instead.
Flood the board with Spirit tokens and enchantments to pump Katilda into a sizable, evasive lifelink threat, then leverage that wide board for an aggressive or token-based assault. Katilda doubles as a recurring resource: after she dies you can Disturb her into an Aura that turns any creature into a flying lifelinker, so you keep applying pressure even through removal. Turn to turn you build a permanent count that powers both halves of the card.
Built-in resilience: Disturb lets her come back as an Aura, and Rising Dawn exiles rather than dies, so it dodges graveyard recursion hate
Lifelink plus flying makes her a strong attacker and stabilizer simultaneously
Scales naturally with two of mono-white's deepest themes — Spirits and enchantments
Protection from Vampires is narrow but free, and the evasion/lifelink package is always relevant
Mono-white means weak card draw, ramp, and interaction relative to other colors
Power is entirely board-dependent — a wrath shrinks her to nothing and crushes your tempo
No inherent way to grind card advantage; can run out of gas in long games
Vanilla beatdown is easy for the table to chump or out-size at higher power levels
Engine potential, but more practically Katilda wants cheap enchantment density to pad her counter.
Lean into permanent density: add cheap, sticky enchantments and reliable Spirit token engines so Katilda is always huge and resilient. Shore up mono-white's weaknesses with ramp (Smothering Tithe, Mana Vault-style rocks) and card advantage (Welcoming Vampire, Mentor of the Meek, Skullclamp on tokens). For higher power, add fast protection (Teferi's Protection, Heroic Intervention-equivalents like Flawless Maneuver) and an anthem-based combo finish such as Cathars' Crusade plus repeatable token generation.
Legendary Creature — Spirit Warlock // Legendary Enchantment — Aura
