That said, you also have Cryptolith Rite which can turn any of your creatures into mana dorks
Going further, you can add Mycosynth Lattice to offset Memnarchs first ability altogether and focus on controlling the battlefield instead
Enchantment - Class Enter the Unknown Target creature you control explores
(Enter the first room or advance to the next room.) As long as you've completed a dungeon, this creature gets +3/+0 and has flying
Every deck in Magic is vulnerable to different sequences of bad draws: not enough lands, not enough spells, color screw, no interaction, only finding half your combo, and so on
For example, Ravenous Rats and Burglar Rats can force your opponent to discard cards, Ichor Rats can poison your opponent and Chittering Witch can quickly build a rat army