Two examples are pictured above: Call the Spirit Dragons and Dracogenesis are two enchantments that are all about Dragons
The only times Think Twice is the better card than Illumination is when you have cost reduction effects, storm or prowess style triggers or a healthy amount of loot, discard and/or self mill
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Its just a worse [card]Elvish Visionary[/card] most times
Remember that you will still have to discard to hand size afterward