stroke of midnight mtg card Magic The Gathering - Foundations - Its controller creates a 1/1 white Human creature token MTG Stroke of Midnight Wilds

Triggered abilities use the word "when," "whenever," or "at." They're often written as "[Trigger condition], [effect]." Some keywords (such as prowess) are triggered abilities and will use "when," "whenever," or "at" in their reminder text

A regular planeswalker with these abilities (+1: add a counter to a critter, -5: Draw two, -10: Add ten mana) would be pretty middling for what Commander decks what to do

For starters, I should point out that constellation is technically not a keyword mechanic but an ability word

Slinn Voda, the Rising Deep enters with a mass bounce effect if you pay its kicker cost, another way to clear the way forward

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