They simply have to do so when you pass priority on the resolution of the ability that permits you to cast the spell
(And keep in mind that instants, sorceries, and enchantments that create tokens don't count for this.) If you're going to go tribal, make sure you're taking full advantage of the tribal cards you're working to play
On maybe one rare, we could create a push-your-luck thing, where the first counter is great, but the second counter is terrible, making you reconsider cards that add 2 or 3 counters at once
Balancing how many basic lands of the appropriate types to play alongside our Summits and Catacombs is important since our plan is to curve out and use mana every turnmaking Frank Karsten's article on the math behind them in Standard required Pirate reading materials
As one of the marquee chases from the games very first set, high-grade copies command a stubborn premium
Wave of Vitriol I just want to throw a Wave of Vitriol at a 5-color player