Its battling in Boros (red/white) all the way, as well as doing some very nice damage with the second triggered ability
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There aren't a whole lot of Legendary cards that can be played at instant speed (and the only actual Legendary Instant is not in these colors), so even though it says 'once each turn,' right now there's not a lot of ways for that to lead to off-turn shenanigans
Scaretiller similarly can bring lands into play from your hand or graveyard when it becomes tapped, but the deck doesn't include any reliable ways to tap it aside from attacking, and no good ways to punish your opponent for blocking or combat tricks to keep it alive
While the prices of many of the decks will almost certainly drop, at least this gives us a reasonable starting point to discuss prices
His evasive keyword gives him moderate protection from opposing characters targeting him, and his What Comes Next ability makes him a constant irritation to opposing players as the moment he hits the field Genie lets his illumineer draw a card immedietely