Population size is always 40, sample size is the number of cards you see by turn N (6+N on the play, 7+N on the draw), successes in population is # of lands in deck (15-19), and successes in sample is just N
If you have fetchlands, you can trigger the effect multiple times a turn, causing massive burn with extra copies
Getting a free extra creature each turn without counting as your spell is also pretty good for Type Four

Scientists Aang's Journey Absorb Vis Abzan Monument Academy Rector Aerial Surveyor Agency Outfitter Ainok Guide Ajani's Aid Alabaster Host Intercessor Alpine Guide Alpine Houndmaster Altar of Bone Ambitious Farmhand Amrou Scout Analyze the Pollen Anchor to Reality Ancient Excavation Angel of the Ruins Angel's Herald Angrath's Fury Arachnus Spinner Archaeomancer's Map Archdruid's Charm Archmage Ascension Arena Rector Arid Mesa Armillary Sphere Artificer's Intuition Ash Barrens Ashiok's Forerunner Asmoranomardicadaistinaculdacar Assembly Hall Atalan Jackal Attune with Aether Auratouched Mage Aurochs Herd Avarax Axgard Armory Ayara's Oathsworn Bad River Balamb T-Rexaur Bant Panorama Basri's Aegis Battalion Foot Soldier Battle Plan Beamsaw Prospector Beanstalk Giant Beanstalk Giant Bebop, Warthog Warrior Bedhead Beastie Begin the Invasion Behemoth's Herald Behold My Grandeur Behold the Beyond Beneath the Sands Beseech the Mirror Beseech the Queen Bifurcate Bilbo, Birthday Celebrant Binding the Old Gods Bioengineered Future Biomechan Engineer Biotech Specialist Birthing Pod Bitterheart Witch Bitterthorn, Nissa's Animus Black Chocobo Blighted Woodland Blightspeaker Blood Speaker

Its also a fast-beating creature thats easy on the mana and can dole out some damage before shields are fully raised
The saving grace is that it probably wouldnt get played that much anyway, so we could give it some leeway