No, commander damage can be dealt through any source of damage, not just combat damage.
Yes, commander damage is exclusively determined by combat damage dealt by a player's commander creature.
In Magic: The Gathering, commander damage is a rule that tracks damage dealt by a player's commander to another player. If a player's commander deals a total of 21 or more combat damage to a player over the course of the game, that player loses the game. This damage is separate from regular combat damage and only counts when dealt by a commander.
In Magic: The Gathering, commander damage is the amount of combat damage dealt by a player's commander to another player directly. If a player's commander deals a total of 21 or more commander damage to a player over the course of a game, that player loses the game. Accumulating commander damage can be a strategic way to eliminate opponents or force them to change their gameplay to avoid being defeated by commander damage.
The mutate mechanic in Commander affects the calculation and tracking of commander damage by allowing a mutated creature to deal commander damage as a single entity, rather than as separate creatures. This means that if a mutated creature deals combat damage to an opponent, the total damage dealt by the mutated creature counts towards the commander damage total, rather than each individual creature's damage.
How much damage have you taken from the commander in this game?
In Magic: The Gathering, melding involves combining two cards to create a more powerful creature. When calculating commander damage, the damage dealt by a melded creature is considered as coming from the commander, affecting the total commander damage dealt to a player.
Yes, lifelink is triggered by any damage dealt by a creature with lifelink, not just combat damage.
In Magic: The Gathering, combat damage is dealt to a player when a creature attacks and isn't blocked. The damage is equal to the attacking creature's power. The player loses life points equal to the damage dealt.
No, "infect" is a mechanic in the game that changes how damage is dealt by allowing creatures to deal damage in the form of poison counters instead of regular damage.
No, trample does not allow a creature to go through protection. Protection prevents damage, enchanting, blocking, and targeting from certain sources, but trample only affects damage dealt during combat.
In a game of Magic: The Gathering, a player loses if they take 21 or more commander damage from a single commander over the course of the game.
In the game of Magic: The Gathering, combat damage dealt to a player does not affect a planeswalker directly. However, a player can choose to redirect combat damage from creatures to a planeswalker they control if they wish. This can potentially damage or destroy the planeswalker.