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
Despite being a little polar I do like the security of this card and will fairly happily play it
Akiri, Line-Slinger paired with Esior, Wardwing Familiar can make this happen
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Two examples are pictured above: Call the Spirit Dragons and Dracogenesis are two enchantments that are all about Dragons