Growth-Chamber Guardian — Ravnica Allegiance Promos #128p

: Adapt 2. (If this creature has no +1/+1 counters on it, put two +1/+1 counters on it.)

Whenever one or more +1/+1 counters are put on this creature, you may search your library for a card named Growth-Chamber Guardian, reveal it, put it into your hand, then shuffle.