You might think infinite life sounds like a lot, and youd be right
8/8 Coro is hungry, and all creatures, whether man or beast, who reside in his domain may one day end up serving him as a fine meal
However, since the choice lies with your opponents, you'll need a backup plan if they decline and turn their now-buffed creatures against you
Speaking of Black Kyurem, worth mentioning the art too, it may not be up to the level of most of this thread, but as someone who loves Zekrom but usually hates Black Kyurem, my first reaction towards it was that it's very cool
Another variant, and the one that's more relevant here, jams in as many 0-cost artifacts as possible and plays Weapons Manufacturing, spitting out a load of Munitions tokens
(G) Level 2: Permanents you control with counters on them have ward (1)