Goblin Medics

Whenever Goblin Medics becomes tapped, it deals 1 damage to any target.

Stonybrook Schoolmaster

Whenever Stonybrook Schoolmaster becomes tapped, you may create a 1/1 blue Merfolk Wizard creature token.

{T}, Tap an untapped creature you control: Add one mana of any color.

{1}, {T}, Tap an untapped creature you control: Create a 1/1 green Saproling creature token.

{T}: Add {C}.
{T}, Tap an untapped creature you control: Add one mana of any color.

Whenever Spireside Infiltrator becomes tapped, it deals 1 damage to each opponent.

Whenever Night Market Lookout becomes tapped, each opponent loses 1 life and you gain 1 life.

Defender
{T}, Tap an untapped creature you control: Add one mana of any color.

As an additional cost to cast this spell, tap four untapped creatures you control.
Draw three cards.