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Valley Floodcaller's second ability applies to noncreature cards in any zone, provided something is allowing you to cast them

In fact in a 5 colour dragon deck Draco is a 6 mana creature

As both cards are dependent on echo coming back, and even then, it would be a discussion about non-mana costsI'd call both a longshot

Includes 5 cards of rarity Rare or higher and 3-5 Uncommon, 4-6 Common, and 1 Full-Art Land card

While it might feel spiky, its not not really

If a player's library no longer contains an artifact or creature card when instructed to reveal cards, that player reveals the entire library, exiles no cards, and then shuffles it