Even if you dont build around Treasure, you still draw off fetch lands, regular sacrifice effects, and so on, all while turning Korvold into a lethal threat due to its +1/+1 counters
Rare Verge lands Five Rare dual-color lands were added to Duskmourn that enter untapped and can tap for a second color if a land identifying either colors already in play
Note that one card you might imagine would be great, Stonewood Invocation, can definitely be useful but doesnt work as well with Riku as you might first think
Tegwyll, Duke of Splendor It was difficult for me to choose between Tegwyll, Duke of Splendor and Alela, Cunning Conqueror, but I think card draw is more consistently helpful than goading even if it cant ever reach the same heights
It doesnt count It does count, because the most expensive version of this card was released in Phyrexia: All Will Be One Collector packs
Jwari Disruption