Megumin, Explosive ArchMage

{x} Cost Instants and Sorceries you cast can't be
Countered
{t}, add {u}{r}
{t}, add {u}{r} for each land you control and put
2 Stun Counters on Megumin. Spend this mana
only to cast Instants or Sorceries with {x} cost.
-Explooosion!!!