Oscilio, Constella Intelligence

Once per Turn Instant - Discard an instant: Draw a card.

Essence of Lightning

Rulings

From the Rosetta + 1st Strike release notes

You may discard a split card that has the instant type on at least one of its sides to pay for Oscilio’s activated ability’s cost.

Keyword notes

Essence - Essence is a new keyword that exists on Elemental hero cards showing what Elements that hero specializes in and what Element cards can be included in the deck.

An Elemental Runeblade with essence of Earth and essence of Lightning can play with Generic cards, Elemental cards, Runeblade cards, Earth cards, Lightning cards and Elemental Runeblade cards. (Note: You cannot play with any card with the supertype Ice, as you do not have the supertype Ice or essence of Ice on your hero)
Your hero must have the essence of Earth for you to play Earth cards but any Elemental hero can play Elemental cards with Earth Fusion. (You wouldn’t have any Earth cards to fuse it though)

All keywords

TalentElemental

ClassWizard

TypeHero

Life36

Intellect4

KeywordsEssence of Lightning

SetsHER, ROS, WIN

Legal inClassic Constructed, Living Legend, Ultimate Pit Fight

ArtistsFederico Musetti

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