pokemon luxray card LV.X #17 Japanese 25th Anniversary Promo BGS 9.5 – Holo Horse Games LLC Twilight Masquerade Singles Luxray Extended art card from

Whether Ob Nixilis is similarly powerful remains to be seen (fingers crossed he's not), but the fact that everyone's talking about it lends credence to the strength of this card

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

Vinereap Mentor A 2-mana 3/2 that gives you a Food token when it enters and when it dies

+2: Up to one target legendary creature gains vigilance, lifelink, and indestructible until your next turn