mtg sacrifice creature cards (SPG) #69 Rules Text: opponent, sacrifice, permanent,

They simply have to do so when you pass priority on the resolution of the ability that permits you to cast the spell

Meanwhile, The Scarab God slowly drains your opponents the more Zombies you control, while also giving you a cheap way to steal your opponents creatures and turn them into Zombies

No, Ill give it a season

With more card draw, you can control games with cards like Organic Extinction, play huge spells like Wake the Past, and get your big creatures and planeswalkers like Brudiclad, Telchor Engineer and Ugin, Eye of the Storms more reliably

Pair this with a restrictive mana cost of three different colors, and maybe Tamiyo wont see as much play as her power level suggests