yugioh structure deck wave of light Yu-Gi-Oh! - - Structure Deck: Wave of Light

You can cast it from exile no matter what # you get, and then you can either spend mana to cast it with mana of any color usable and then you can get it for free with the higher roll

In a four or five color deck this can shut down almost all potential attacks

8 Purging Stormbrood Draconic Protection Omen cards in Tarkir: Dragonstorm fill multiple roles in your Limited deck, letting you hang on to them for a bit if you want the creature side, or to cast the generally cheaper omen side for a more immediate need

It's really that good

If unanswered, it accelerates your game plan while it disrupts opponents, which is why it remains a staple threat across multiple competitive formats