Example: If an attacking creature is blocked by two creatures, this is one event for a triggered ability that reads “Whenever this creature becomes blocked” but two events for a triggered ability that reads “Whenever this creature becomes blocked by a creature.”
700General
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Example: Fact or Fiction reads, “Reveal the top five cards of your library. An opponent separates those cards into two piles. Put one pile into your hand and the other into your graveyard.” While an opponent is separating the revealed cards into piles, they’re still in their owner’s library. They don’t leave the library until they’re put into their owner’s hand or graveyard.
Example: Altar of the Pantheon is an artifact with no colored mana in its cost and an ability that says “Your devotion to each color and each combination of colors is increased by one.” Purphoros, God of the Forge is a permanent mana cost {3}{R} and an ability that says “As long as your devotion to red is less than five, Purphoros isn’t a creature.” If a player controls both of these permanents and another permanent that costs {R}{R}{R}, that player’s devotion to red is calculated to be five before Purphoros’s type-changing effect is applied, and Purphoros is a creature.
Example: An ability reads “Target creature gets +2/+2 until end of turn. Destroy that creature at the beginning of the next end step.” The ability will destroy the object it gave +2/+2 to even if that object isn’t a creature at the beginning of the next end step.
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Example: A player casts Bark-Knuckle Boxer, which costs {1}{G} and reads “Whenever you expend 4, this creature gains indestructible until end of turn.” After it resolves, that player casts Divination, a spell that costs {2}{U}. Prior to paying the cost to cast Divination, that player has spent two mana to cast spells this turn. After paying the cost, they have spent five mana to cast spells this turn. Since they have now spent at least four mana to cast spells this turn, Bark-Knuckle Boxer’s ability triggers.