Urtet, Remnant of Memnarch 
Legendary Artifact Creature — Myr
Whenever you cast a Myr spell, create a 1/1 colorless Myr artifact creature token.
At the beginning of combat on your turn, untap each Myr you control.
{W}{U}{B}{R}{G}, {T}: Put three +1/+1 counters on each Myr you control. Activate only during your turn.
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Full Throttle 84%
$6.07#1495
"At the beginning of each combat this turn, untap all creatures that attacked this turn."