Zuurker, Shadow Harvester

Double Strike, Flying, Vigilance, Lifelink, Haste
Shades you control have Skulk.
{b}: Zuurker get +2/+0 until end of turn.
{b}, Pay 1 life: Target Shade you control get -1/-0 until end of turn. The next time it deals combat damage, draw two cards.
Sacrifice a nontoken Shade you control: Create two 2/1 black Shades creature tokens with Flying.
If Zuurker would deal damage to a player the second time each turn, instead prevent that damage and add that much {b}. Use this mana only to cast or activate ab