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Whenever chaos ensues, target Dalek you control deals damage equal to its power to target creature you don't control

Hardened Scales is likely the most obvious choice for the deck

The card basically reads as "if your opponent takes game actions, you draw a card, oh hey, and also, no looping extra turns over there, guy." That's under normal game conditions, mind you

Since then, Dragon-type cards have been difficult to balance, and some are currently dominating the meta of the Standard Format

However, all the other secret missions don't reward new cards, so the only way you'll discover them is by completing them yourself or hearing about them