Limit Break, based on Final Fantasy VII
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
1 Appearance Game "Yu-Gi-Oh
Enchantment Color tag templates(None) Light of Promise Enchant creature Enchanted creature has "Whenever you gain life, put that many +1/+1 counters on this creature." Enchantment - Aura Color tag templates(None) Palace Siege As this enchantment enters, choose Khans or Dragons
Should treasures be in greens slice of the color pie
drawing three extra cards doesnt mean much if you cant back them up, so getting a massive beater to do just that is essential