Dr. Madison Li

Whenever you cast an artifact spell, you get {E} (an energy counter).
{T}, Pay {E}: Target creature gets +1/+0 and gains trample and haste until end of turn.
{T}, Pay {E}{E}{E}: Draw a card.
{T}, Pay {E}{E}{E}{E}{E}: Return target artifact card from your graveyard to the battlefield tapped.

Whenever you cast an artifact spell, you get {E} (an energy counter).
{T}, Pay {E}: Target creature gets +1/+0 and gains trample and haste until end of turn.
{T}, Pay {EEE}: Draw a card.
{T}, Pay {EEEEE}: Return target artifact card from your graveyard to the battlefield tapped.

Fallout

Whenever you cast an artifact spell, you get {E}.
{T}, Pay {E}: Target creature gets +1/+0 and gains trample and haste until end of turn.
{T}, Pay {EEE}: Draw a card.
{T}, Pay {EEEEE}: Return target artifact card from your graveyard to the battlefield tapped.