It is an ability word with the following text: "Whenever CARDNAME becomes the target of a spell or ability you control for the first time each turn." It's a variant on the heroic mechanic from the original Theros block, but it's triggered by spells and abilities and only triggers once per turn
These are just a few of the ways red can now draw extra cards and attempt to maintain a card advantage over its opponents
Although those force card draw and interact well with the payoffs well discuss today, those arent quite the same
That said, this will probably be simple and easy to play since just about any Magic player knows enough to be able to just play a good stuff deck in Commander and not worry too much about the decks synergies
Ephemerate is one of those cards, which can be either non-existing or almost dominate the format , so I currently see it in between being really good in 4c Elementals/Omnath and Esper Reanimator
Theres enough of both enablers and payoffs within the WR card pool that these decks feel extremely consistent and powerful basically impossible to block against