Idris, Soul of the TARDIS
Vanishing 3 Imprint — When Idris enters, exile another artifact you control until Idris leaves the battlefield. Idris has all activated and triggered abilities of the exiled card and gets +X/+X, where X is the exiled card's mana value.
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Official rulings (3) · Scryfall
Triggered abilities use the word "when," "whenever," or "at." They're often written as "[Trigger condition], [effect]." Some keyword abilities, such as prowess, are triggered abilities and will have "when," "whenever," or "at" in their reminder text.
If the exiled card has an {X} in its mana cost, the value of X is 0 when determining that card's mana value.
Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keyword abilities, like equip, are activated abilities and they have colons in their reminder text.