If you are confident that resolving Tibalt will result in making two devil tokens then he is a great include
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Kiora, the Rising Tide serves a different purpose, as I can see this card slotting into Dimir Midrange
it just costs 8, and there's really no synergy in assembling it, and you can only run one copy of it and there aren't a lot of tutors and it costs WBURG in addition to costing 8, so it's a hard 8 to cast (so to speak) and all someone has to do in response is cast Swords to Plowshares or something and if you don't win you don't get anything so
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There are a lot of cool ways of putting out loads of Dragons at once in Commander, and if they all come in at the same time, you can quite easily end up dealing eight damage eight times, which is more than enough to end most fights