mtg green commander decks Duel — foil at your local game store. Green Commander Decks | eBay

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

This cute chicks small stature and fluffy appearance bring levity in difficult times

Portent of Calamity For five mana I can drop Omniscience if its in my top four cards on top of drawing three cards

Equipment cards are often relegated to Equipment decks in Commander

Counter target activated ability, triggered ability, or noncreature spell

Sometimes I'll add a dork or two from them, but this and the order is mine