Perhaps the best example is Aang himself, who has a mono-White card in Aang the Last Airbender, a tricolor version in Aang at the Crossroads, and a four-color version that turns into a WUBRG creature in Avatar Aang/Aang, Master of Elements
Triggered abilities use the word "when," "whenever," or "at." They're often written as "[Trigger condition], [effect]." Some keyword abilities are triggered abilities and will have "when," "whenever," or "at the beginning of" in their reminder text
Backup was just a particularly lovable mechanic in Limited, and I'm hopeful we have some cards that will play roles elsewhere
This is the first colorless spell that produces an extra combat, and its repeatable
Most of those are pretty bad, but I love a commander that incentivizes playing with cards that don't have a home anywhere else
Sorcerer pits vampire against Lovecraftian horror, demonic hellspawn against mythological monster and MTG-like card battles against gameplay that veers between fighting for control of areas of the city, deckbuilding and rolling dice