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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

Elegy AcolyteElegy Acolyte is an interesting card, mostly because its static ability is a somewhat nice impression of Tymna the WeaverTymna the Weaver

Red Cards are aggressive

Add pieces like Agathas Soul Cauldron or Grist, the Hunger Tide , and those loops turn into lethal engines

The play is fun, rewarding, and pretty consistent if you use your draw cards