A lot of balance and care goes into choosing the cost of a card, more than I can express here, but looking for similar effects on existing Magic cards can give you an idea of a fair costfor example, a ramp spell that puts two lands into play ought to cost 4 mana, per Explosive Vegetation
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Card Name Mana Cost Type Enchantment Rarity Rare rules Text Whenever a player casts a spell from their hand, that player exiles it, then exiles cards from the top of their library until they exile a card that shares a card type with it
That space has instead been filled by the open secret that is fan-created unofficial emulators and simulators
You cannot Special Summon monsters while this card Special Summoned by this effect is in the Monster Zone, except Reptile monsters
Meanwhile, Gurgling Anointer starts off as a 1/3 flier for three, which isn't great
