The only trick is figuring out how to activate delirium, but with so many discard outlets in red, that shouldn't be too hard
It will mostly be used in G/R Ramp style decks alongside Hour of Promise as a somewhat inefficient removal spell that doubles as a finisher against control decks, but I could also see red aggro decks that play it in their sideboard for the control matchup because of one card: Settle the Wreckage
Lulu is a great addition to any EDH decks that care about counters, but Stun Counters, in particular, may be in demand soon
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Though the set is still in its pre-release state, sales for the card have stayed fairly stable at this point