Viernic the Storm

When Viernic the Storm enters the battlefield,
you may counter target spell. If a spell is counted
this way, you may place it on top of your deck.
Hexproof.
Wherever Viernic the Storm attacks, add a mana
of any color to your mana pool, use this mana
only to cast an instant, sorcery, or enchantment.
"Thought me too old, didn't you?!"