Manahive

Try these cards for similar effects in green and white:
1. Worldly Tutor (Green, instant, finds a creature, top of library)
2. Eladamri's Call (Green/White, instant, creature to hand)
3. Summoner's Pact (Green, instant, finds green creature, hand)
4. Chord of Calling (Green, instant, puts creature into play)
5. Green Sun's Zenith (Green, sorcery, puts green creature in play)

All are creature tutors with instant speed or library manipulation like Congregation at Dawn.