It was given at the League Play Dec 2011
Level 1 (3): During your turn, you can attach a card from your hand to Yoko. In that case, if another card was already attached to Yoko due to this effect, mova that card yo your hand.
Level 2 (4): When Yoko`s health would be reduced to 0 or less, you can reduce her maximum health by 20 then heal her to full health instead.
- Resident Evil Deck Building Game: Yoko Susuki Promo