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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

The Professor is a great combo with Lyla, Holographic Assistant to draw as much of our library as we want, since we get to toss a counter on him whenever we draw, which will draw us another card and subsequently another counter, and so on

Dino Cry allows you to accelerate 2 Fighting Energy to itself, but it comes at the cost of ending your turn

This is called the Legend rule

youre just increasing the number of games youll walk away frustrated