SenixPrime, Digital Dweller

For every Prime spell or land you control, add a +1/+1 counter to this spell.

{1}{w}{t}: Discard 1 card, search your library for a Prime spell and put it in your hand, then shuffle your library.

When this spell has 3 or more +1/+1 counters on it, transform this creature. It retains its type as a creature with 4/5 power and toughness in addition to its other types. (Loyalty abilities can still be activated)