At the beginning of combat on your turn, put your choice of a +1/+1, first strike, vigilance, or menace counter on Me, the Immortal.

Counters remain on Me as it moves to any zone other than a player's hand or library.

You may cast Me from your graveyard by discarding two cards in addition to paying its other costs.

Sisterhood of Karn enters with a +1/+1 counter on it.

Paradox — Whenever you cast a spell from anywhere other than your hand, double the number of +1/+1 counters on Sisterhood of Karn.