Pioneer Masters

Hopeful Eidolon | Enchantment Creature | Spirit | Bestow {3}{W} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.) Lifelink (Damage dealt by this creature also causes you to gain that much life.) Enchanted creature gets +1/+1 and has lifelink. | Min Yum

Aqueous Form | Enchantment | Aura | Enchant creature Enchanted creature can't be blocked. Whenever enchanted creature attacks, scry 1. (Look at the top card of your library. You may put that card on the bottom.) | Slawomir Maniak

Quicken | Instant | | The next sorcery spell you cast this turn can be cast as though it had flash. (It can be cast any time you could cast an instant.) Draw a card. | Aleksi Briclot

Rapid Hybridization | Instant | | Destroy target creature. It can't be regenerated. That creature's controller creates a 3/3 green Frog Lizard creature token. | Jack Wang

Retraction Helix | Instant | | Until end of turn, target creature gains "{T}: Return target nonland permanent to its owner's hand." | Phill Simmer

Tome Scour | Sorcery | | Target player mills five cards. | Steven Belledin

Tormented Hero | Creature | Human Warrior | Tormented Hero enters tapped. Heroic — Whenever you cast a spell that targets Tormented Hero, each opponent loses 1 life. You gain life equal to the life lost this way. | Winona Nelson

Illness in the Ranks | Enchantment | | Creature tokens get -1/-1. | Nils Hamm

Dark Betrayal | Instant | | Destroy target black creature. | Nils Hamm

Touch of Moonglove | Instant | | Target creature you control gets +1/+0 and gains deathtouch until end of turn. Whenever a creature dealt damage by that creature dies this turn, its controller loses 2 life. (Any amount of damage a creature with deathtouch deals to a creature is enough to destroy it.) | Scott Murphy

Coordinated Assault | Instant | | Up to two target creatures each get +1/+0 and gain first strike until end of turn. (They deal combat damage before creatures without first strike.) | John Severin Brassell

Monastery Swiftspear | Creature | Human Monk | Haste Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) | Steve Argyle

Aspect of Hydra | Instant | | Target creature gets +X/+X until end of turn, where X is your devotion to green. (Each {G} in the mana costs of permanents you control counts toward your devotion to green.) | Mark Winters

Experiment One | Creature | Human Ooze | Evolve (Whenever a creature you control enters, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.) Remove two +1/+1 counters from Experiment One: Regenerate Experiment One. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.) | Chase Stone

Hero of Leina Tower | Creature | Human Warrior | Heroic — Whenever you cast a spell that targets Hero of Leina Tower, you may pay {X}. If you do, put X +1/+1 counters on Hero of Leina Tower. | Aaron Miller

Fog | Instant | | Prevent all combat damage that would be dealt this turn. | Jaime Jones

Natural State | Instant | | Destroy target artifact or enchantment with mana value 3 or less. | Volkan Baǵa