David, Harbinger of Creation

Whenever you cast a non-Human creature spell, investigate. (Create a colorless Clue artifact token
with "{2}, Sacrifice this artifact: Draw a card.")

{2}{b}, {t}, Sacrifice three Clues: Choose one —
• Search your library for a Xenomorph card, put that card into your hand, then shuffle.
• Put a +1/+1 counter on each Xenomorph creature you control, then proliferate.