Gatewatch

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The Gatewatch is a team of planeswalkers that joined up during BFZ. Their goal is to stop interplanar threats (which typically means planeswalkers, but can apply to other things such as Eldrazi). They were received some hostility by MTG players at least in part because they received so much focus, at the expense of seeing what other characters are up to (which WotC has noticed and decided to tone down the focus on the Gatewatch).

Oaths

This is a 'cycle' of cards that goes spans not only sets, but worlds. Whenever a character joins the Gatewatch, that set gets an Oath of [new member] card. Each oath is a legendary enchantment that has 2 abilities. One that does something without needing a planeswalker, and another that doesn't do anything if you don't have a planeswalker ("have" in this case doesn't mean control in this case, e.g. Oath of Ajani makes walkers cheaper).