Simian Spirit Guide

Dryad Arbor

(This land isn't a spell, it's affected by summoning sickness, and it has "{T}: Add {G}.")

Mob Mentality

Enchant creature
Enchanted creature has trample.
Whenever all non-Wall creatures you control attack, enchanted creature gets +X/+0 until end of turn, where X is the number of attacking creatures.

Crookshank Kobolds

Gitaxian Probe

({U/P} can be paid with either {U} or 2 life.)
Look at target player's hand.
Draw a card.

Memnite

Shifting Wall

Defender (This creature can't attack.)
This creature enters with X +1/+1 counters on it.

Phyrexian Walker

Atog

Sacrifice an artifact: This creature gets +2/+2 until end of turn.

Shield Sphere

Defender
Whenever this creature blocks, put a -0/-1 counter on it.

Reckless Charge

Target creature gets +3/+0 and gains haste until end of turn.
Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Ornithopter

Phyrexian Marauder

This creature enters with X +1/+1 counters on it.
This creature can't block.
This creature can't attack unless you pay {1} for each +1/+1 counter on it.

Lotus Petal

{T}, Sacrifice this artifact: Add one mana of any color.

Elvish Spirit Guide

Exile this creature from your hand: Add {G}.

Stomping Ground

({T}: Add {R} or {G}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.