mtg are secret lair cards legal in commander Magic: The Gathering's PlayStation tie-in revealed Magic the Gathering MTG Secret

So you can easily harvest 14 or 15 mana of cards from your 7 mana investment even in a deck not built around breaking it

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Today at MagicFest Richmond, Wizards of the Coast revealed the Mystery Boosters that they teased last month

But the Engineer is also an amazing mana sink later in the game

Heliod, The Warped Eclipse allows its controller to cast spells as though they had Flash (in other words enabling them to be cast at Instant Speed) and makes all spells cast during the opponents turn one mana cheaper for every card that your opponents have drawn in that turn

I had spelled out what we had to do