The primary use for Trove of Temptation so far has been in Commander. It's pretty much an auto-include in Admiral Beckett Brass Pirate Tribal decks, due to the Treasure token synergy. It's also popped up in some O-Kagachi, Vengeful Kami EDH lists, as well, as a sweet piece of tech. But people are trying to build Standard decks with it, too - as seen on deckbox.org and deckstats.net. Let's see what this card does.
Trove of Temptation is one of my favorite kinds of cards. They sort of sit there and give you incremental value. It's also very flavorful, so it's a win-win for me. The first effect is very straightforward.
Each opponent must attack you or a planeswalker you control with at least one creature each combat if able.
The whole Temptation aspect of this card is admittedly rather cute. But it's also effective. This effect can lead to some very unfavorable combat steps for your opponents, especially in multiplayer situations. Given a fairly developed boardstate and substantial creature on your corner of the battlefield, you're forcing opponents to potentially choose which of their creatures will walk the plank each combat. This is a pretty useful to slowly grind out some value through forced attrition.
This is also a very good effect to have in O-Kagachi decks because the Legendarry Spirit has a relevant ability:
Whenever O-Kagachi, Vengeful Kami deals combat damage to a player, if that player attacked you during his or her last turn, exile target nonland permanent that player controls.
Hurray for synergy!
But wait... THERE'S MORE!
At the beginning of your end step, create a colorless Treasure artifact token with "T, Sacrifice this artifact: Add one mana of any color to your mana pool."
This is the Trove aspect of the card. After 4 turns, the Trove of Temptation essentially pays for itself through Treasure tokens. Not only is this a nice way to grind out Treasures to satisfy the alternate win condition of Revel in Riches, it also provides some mana fixing and additional resources at a fair investment.
This is such a grindy card. It seems best suited for the multiplayer Commander world or the kitchen table. But this doesn't stop players from stuffing 2 or more copies into brews. While the first ability doesn't stack, the Treasure token creation does. So in decks that play lots of grindy value-generating stuff like Aid From the Cowl and other Enchantments with Revolt, it's a nice way to generate some extra mana to be able to stay competitive on the mana curve. (In other words, the Treasures keep you in the game.)
Trove of Temptation is a mere $0.20 or so, and it's hardly a target for speculation. But this is a nice little under-the-radar uncommon that you shouldn't be giving away for free. It might buylist for a nickel or so eventually. But more importantly, it's just another little nugget of value from Ixalan that deserves to not be overlooked.