You generate mana before you pay costs. If you absolutely need Selvala to generate enough mana (for example, she HAS to generate 2 mana because you only have two untapped Forests as other sources), then you can't finish casting the spell and the game rewinds to before you put it on the stack, with the exception that we don't undo Selvala's mana ability.
If you're going to use Selvala to cast a spell, and you need her to generate enough mana, tap her first. It saves everyone a headache.
That one doesn't work so well. If you tap the Defector, then the ability has to resolve before you can cast your Evolution because Sorcery, and by then you don't have a Defector to sacrifice.
If you cast Evolution first, the Defector is dead by the time you have priority to activate it.
If you could cast Evolution as though it had flash, though (Vedalken Orrery, for example), you could tap your Defector, then sac it to Evolution and still get your draws.
Michael Adams
But what if I want to use her for shenanigans?
Nicholas Foster
I Know, that is why I needed the clarification, if I must give flash to Eldritch evolution, all became to complicated to be useful :(
Thanks again For the answers ;)
Benjamin Anderson
Then I fill frown disapprovingly in your direction.
Does ghost apply similarly to blocking? Imy not actually aware how blocking works but I understand you can sacrifice, tap, etc. The monster after declaring blockers and still block the attack (for the most part)
Thomas Hill
I'm not sure what you mean by "ghost".
Sebastian Ortiz
By ghost I mean this. I'm a phone poster lol
Connor Ramirez
Ah. Then yes. If you block with something and then it leaves the board for whatever reason (blinked, sacced, hit by a Doom Blade, whatever), whatever it blocked is still blocked. You won't take damage, unless you were blocking a thing with Trample, in which case you take very much damage.
