Gatewatch

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The Gatewatch is a team of planeswalkers that was first formed 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. The first one is an ETB and you don't necessarily need a planeswalker. The second ability is an ability that interacts favorably with you having a planeswalker ("have" in this case doesn't necessarily mean "control" in this case, e.g. Oath of Ajani makes walkers cheaper), and does stone cold nothing if you don't have a planeswalker.