No, all that is required is good reading comprehension skills
Profesional tournaments however may be age restricted, but that has nothing to do with playing for fun with friends or at home.
The box/packs do say '13+' this is likely do to a few things; the aforementioned reading comprehension level, but also the arithmetic involved would make it less enjoyable for younger audiences. It should also be mentioned that there is a darker aspect to the 'flavor' of the game that might not be suitable for some audiences.
No, you cannot play instants during the untap phase in Magic: The Gathering.
There is a very specific way to play Magic the Gathering Battlegrounds. One can play Magic the Gathering Battlegrounds by purchasing the game at popular retail stores such as Game Stop, Best Buy, and Amazon.
Anything that is not on the Battlefield, is 'not in play'.
You can play a sorcery card in Magic: The Gathering during your main phase when the stack is empty and it's your turn.
You can play instants during a game of Magic: The Gathering at any time, even during your opponent's turn.
There is no best card. It all depends on how you play and your preferences. In terms of power and toughness, it's the 13/13 Krosan Cloudscraper.
The best places to play Magic: The Gathering are local game stores, gaming conventions, and online platforms like Magic: The Gathering Arena. These places offer opportunities to compete, socialize, and improve your skills in the game.
In a game of Magic: The Gathering, you can play as many planeswalker cards as you want, as long as you can afford to cast them and they don't have the same subtype.
It is easier to play WoW TCG.
The pace of play in Magic: The Gathering is sometimes considered too slow for tournament standards, as players have a limited amount of time to make their moves.
The most popular Magic: The Gathering color combinations used in competitive play are Blue-White, Red-Green, and Black-Green.
You can return exiled cards to play in Magic: The Gathering by using cards or abilities that specifically allow you to do so, such as "Flicker" effects or cards with the "Return from Exile" ability.