If you want to watch the announcement video, you can see everything for yourself here
In fact, you dont even need to deal combat damage at all if you have some other ways of damaging your opponent, which plays well alongside quite a few cards in Rakdos that profit from dealing damage directly to your opponents: I think this makes Abaddon different enough to warrant being considered more than a worse version of Yidris, and I think an Abaddon deck is going to look much different
One factor has been increased popularity among YouTubers and Twitch streamers posting viral unboxing videos
Nature's Claim 3.5 Cheap instant removal is great, having it hit various different things is great
You get to draw an extra card each turn, for 1 ink, provided you can correctly predict the card you will draw
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