Sewers Under Kasprah – White Plunge & Blue Flush

Our first Legendary creature coming up!

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Lose the Way is a fairly benign Plunge effect, similar to Pressure Point but with Plunge instead of 'Draw a card'. Hooded Anathema is similar to the blue Juvenile Feeder from earlier, except that if you get through with Hooded Anathema, you don't assign combat damage. Blind Condylur is a Defender with Plunge on attack, so you can pay mana to have it be able to attack. Overall, I think Hooded Anathema and Blind Condylur are a bit complicated for commons, but not powerful enough to be moved to uncommon or rare territory.

Sanguine Forecast is both a Plunge with a semi-Backup effect. Terrifying Strike is an instant that gives a creature Plunge on damage, but since it also gives doublestrike, it is possible you will be able to double Plunge off of it. Spurned Legionnaire is something of a Mentor of the Meek style effect, but for Plunge rather than card draw, encouraging you to go wide. Last Breath is our first legendary creature for the set. It has three Plunge triggers, and allows you to gain life off the Plunge. Therefore, this lets you Plunge, but it can do its part in lifegain decks as well.

Each of the cards above are basic blue spells, with Flush tacked on, as Flush cards tend to be.

Here we start to get interesting things. The common Flush payoff here gives Slippery Mutant unblockable for the turn. Interrupted Ploy is interesting because it doesn't outright counter a spell, but has a Mana Leak-style effect, except that the opponent has to essentially pay double the cost of the spell to cast it. In all but the most late-game grinds, this should be pretty much a hard counter. The other two cards are again basic blue cards with Flush tacked on. It's tough to make Flush an interesting mechanic worthy of discussion; truly, like Plunge, it offers inevitability and value for control decks more than anything.