Glub, The forgetful Guest

Cleave {2}{w}{u}{g} (You may cast this spell for its cleave cost. If you do, remove the words in square brackets.)

Escalate {g/w}
Glub enters with all chosen abilities. —
• Lifelink.
• Whenever you gain life, draw a card if you gained more life than you have cards in hand.
[• Whenever an opponent casts a creature they may pay {1} or Cleave {2}. If they don't, draw a card. If they do Glub and that creature explore [and you draw a card.]
{bull} {t}: Scry 2.]