Ground types resist 2 types, which they receive half damage from: Poison - Cant harm inorganic materials, like dirt and sand
Have your listings end at opportune times
Target opponent exiles cards from the top of their library until they exile a nonland card
+1/+1 counters are a great target, but if you're really looking for some spice, try to ult planeswalkers the turn they come down, or turn one poison counter into ten before your opponents have a chance to react
Keen Sense For only one mana, [c]Keen Sense[/c] can draw you many cards over the course of a single game, but only if you can sneak the enchanted creature past your opponents defenses
If the Germ dies, you can simply pick it back up for mana, redeploy it later, or even just move it onto another Creature and keep the pressure going