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So, flash is at its best when you cast it at unpredictable times

In addition to Demons, Devils, and Tieflings, Raphael also buffs Impsand any excuse to play classics from the ancient days, Nettling Imp and Maddening Imp, are okay by me

But if you have other mana sources, hold on to it to use its channelling ability at instant speed and destroy a key part of your opponent's engine

This is true whether you're already in Undercity or any other dungeon.

Lifelink is still incredibly powerful when a format is dominated by red, and I expect to see Legions Landing show up in many different decks in Standard, maybe even paired with Crested Sunmare