1mana monsters

Uses:

Lowly Slime: Slime Champion or just about any Slime theme in general.
Kelar Citizen: Manamancer focused deck.
Gremlin: Direct damage theme (Uprising) and mini-rush (Kelar Towers won't protect against the direct damage).
Skeleton: Possible to pay for itself and give you a mana bonus; also sac-site theme.
Melrak Follower: Way to deal with Starship Blockade or vendor NPC, especially potent with Norlaan, Prime.
Holy Acolyte: Holy Wordbringer stall, especially if paired with M-Yaiba.
Fairy: Fairy Kingdom + Fairy = free attacker/defender +5 attack (I'll note we haven't gotten to the revised stats for 1 costers yet ^_^).
Mubble: Dizzying defense.
K-army Guy: Anti-Hero theme (no pun intended), works well with Ramjet Arms.
Evil Soldier: Can kill vendor NPC & do double damage to lifebar monsters (nearly same ability as Shade Dragon), and reduce healing to just 5 damage.
Skyrian Soldier: Reduce damage of Mine Field, reveal facedowns so that you don't effect D them simply out of paranoia.
Lokar Guard: Can be comboed with K-Army Guy, gives you a attacker/defender and allows you to draw another soldier on top of playing this.