Frogmite

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)

Myr Enforcer

({B/P} can be paid with either {B} or 2 life.)
Flying
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Counter target spell unless its controller pays {1}.

Choose one —
• Counter target blue spell.
• Destroy target blue permanent.

{1}, {T}, Sacrifice Chromatic Sphere: Add one mana of any color. Draw a card.

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

Galvanic Blast deals 2 damage to any target.
Metalcraft — Galvanic Blast deals 4 damage instead if you control three or more artifacts.

{1}, {T}, Sacrifice Chromatic Star: Add one mana of any color.
When Chromatic Star is put into a graveyard from the battlefield, draw a card.

Choose one —
• Counter target red spell.
• Destroy target red permanent.

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Draw two cards.