No, Insurrection does target any creatures as it does not contain the word target.
So insurrection can still effect cards that have shroud or Protection from Red.
A permanent with shroud cannot be the target of spells or abilities.
If a card doesn't say it targets, then it does not target. Windstorm does not target at all, so it will affect even creatures with Shroud. Cards that pick multiple targets will still mention the word target.
Yes, in Magic: The Gathering, you can return a target creature card from your graveyard to the battlefield using certain cards or abilities.
If a card's not a land, then it's a spell - a creature on the stack waiting to resolve is a 'creature spell', for example. You can use a 'counter target spell' card against creature spells, instants, artifact spells, etc, the only things you can't use it on are lands, or activated abilities.
Mercy Killing targets one creature, and the creature's controller sacrifices it when Mercy Killing resolves. That player then gets some Elf tokens, as outlined on the rest of the card.
To return a target creature to its owner's hand in the game, you can use cards or abilities that have the "return target creature to its owner's hand" effect. Look for cards with this ability in your deck or in the game's card pool to achieve this action.
If you are talking about a card like Zombify, then this is 'cast' when you pay its mana cost and put it on the stack. On resolution, the target creature will be placed on the battlefield. Only Zombify is being cast, the creature itself is not being cast, so a card that only counters creature spells could not be used here. If you are talking about an ability of a card, then this is never counted as a spell, it is not 'cast', nor is the target creature counted as being cast either. Only ability negation cards can be used (such as Stifle).
ok if it says deal X damage to target opponent than deal X damage to opponent and NOT creature. if it says deal X damage to target creature than deal it to the creature and NOT the player. if it says creature and player deal it to a creature and a player ect. the point is you will get a strait awnser if you just READ THE CARD, AND NEVER BEND WHAT THE CARD IS SAYING. ex: if it says get a creature from the grave and you get a instant you are bending the rules (it happens ALOT).
'Prey Upon' requires two valid targets - one creatre you control, and one you do not. There are otherwise no restrictions, apart from the usual things like being unable to target opponent's creatures with Shroud, or Protection from: Green.
The amount of damage dealt to the target creature or player depends on the source of the damage, such as a spell, ability, or attack. The damage is typically specified in the card or ability that is causing it.
In Magic: The Gathering, a player can lose indestructible status if the card with indestructible is targeted by a spell or ability that specifically removes indestructible, such as "exile target creature with indestructible" or "destroy target creature with indestructible." Additionally, if the card's controller loses control of the card or if the card leaves the battlefield, it will also lose its indestructible status.
No because it cannot target the creature. Read the hexproof ability