Does Pyroclasm kill true name nemesis?

No one can make you feel inferior without your permission. Technically, Pyroclasm doesn’t “destroy” anything, it just deals damage.

What is protection MTG?

A creature with protection from one or more colors of magic cannot be affected by any magic of those colors. For example, a creature with protection from blue cannot be blocked by blue creatures, dealt damage by blue creatures, or enchanted, damaged, or otherwise affected by blue cards.

Can a protected creature block?

As you noted, a creature with protection from something can’t be blocked, targeted, dealt damage, enchanted, or equipped by anything that has that “something” quality. That quality is usually one or more colors.

Does protection from a color protect against board wipes?

Other than that, protection from certain colors won’t protect you from wrath spells or mass removal since they only prevent the permanent from being targeted, damaged, blocked, and enchanted. Hexproof also works the same way, but since board wipes target the board, they’ll bypass these keywords.

Does protection prevent damage?

One thing that protection does is to prevent damage from sources with the stated quality, yes. In Magic “can’t” beats “can”. So if something says that it can prevent damage and something else is saying that it can’t, then the damage can’t be prevented no matter which effect came first.

Does questing beast prevent protection?

Questing Beast only stops combat damage from being prevented by effects that specifically use the word “prevent.” The damage Questing Beast deals to the target planeswalker as its last ability resolves isn’t combat damage.

Does protection from color stop multicolored?

A multicolor card that’s green and blue is fully green and fully blue. Protection from blue will fully work against it, because it is a blue card. The creature with protection can’t be targeted, enchanted, damaged or blocked by it.