What is the ability flash in magic the gathering?

Answer 1

A card with Flash can be played at any time that you could play an instant. That means you are able to cast (usually) creature spells in response to a spell or ability, or cast a creature in the opponent's turn.

Lets say you have nothing but 8 mana in play, and you opponent has a 4/4 creature and he is about to attack you and you have nothing to block with, so lets also say you have angel of salvation a 5/5 creature with Flash in your hand what you can do is play him and block, remember to tap your mana.

Some creatures with Flash have an effect that goes on the stack when the creature comes into play. Mystic Snake is one example, you can cast the creature spell in response to a spell, it will resolve, then its counter spell ability will activate, and can counter that initial spell.

Answer 2

An instant card may be played at any time you have priority during the game, priority passes backwards and forwards in each step of a turn and each step progresses only when both players decide that they do not wish to take any action.

On your turn you gain priority first, on your opponents turn you gain priority second.

Normally non-instant permanent cards can only be cast on your turn, during your main phase when you have priority and the stack is empty, the Flash ability removes this restriction and allows the casting of the spell to be performed as though it were an instant (i.e. Any time in the game where you have priority, even when something is on the stack).

Answer 3

it means you can play the card like it was an instant, while it is a creature etc.