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Tiamat lets you search your library for any 5 DRAGONS you want

Janjeet Sentry Other than a Kiki-Jiki combo, I dont see how you make Janjeet Sentry worth it even in a dedicated energy deck

From the Structure Deck 8: Lord of the Storm set

For players who frequent the same playgroups with the same decks week after week, introducing lock cards which target only one deck at the table will inevitably be taken as personal, even if just within the politics of threat assessment. Sleeving up these sorts of cards can feel like the start of a spiteful arms race, where players without the resources to change commanders regularly are sitting ducks against spells never balanced for main-decking against known opposition