Its not likely to happen immediately, but this Diabolic Intent reprint makes it legal in Modern, Pioneer, and Standard
These function like spells attached to lands in that they give you a way to use your mana, mitigating the effect of flood since you can do something, and helping ease mana screw because you can slip in a few extra lands
A cameo by Psyduck and Bellsprout, the PSA 9 version of this card sells for over $1,000, with sales in June around $1,200
This beginner-friendly guide breaks down the basic rules and setup into easy steps
[18] Believing that Sora's smile when they first Dueled was genuine, Yuya tried to make Sora see the error of his view about Dueling, but Sora just ridiculed Yuya's belief and persisted that Dueling is to continue fighting
This is true even if the ability states that must be paid with a certain color of mana, as Crimson Hellkites ability does