Teostra, Scorn of the Sun

At the beginning of your upkeep, put one sun counter on Teostra.
Whenever Teostra deals damage to a creature, put one blast counter on said creature.
{r}{r}: Teostra deals 3 damage to all creatures with 3 blast markers or more. Remove all counters if this is done.
{3}{r}, Remove all sun counters from Teostra:
Teostra deals 5 damage to all creatures you opponents control.