The Lost Caverns of Ixalan

Miner's Guidewing | Creature | Bird | Flying, vigilance When Miner's Guidewing dies, target creature you control explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on that creature, then put the card back or put it into your graveyard.) | Allen Douglas

Cogwork Wrestler | Artifact Creature | Gnome | Flash When Cogwork Wrestler enters the battlefield, target creature an opponent controls gets -2/-0 until end of turn. | Tomek Larek

Greedy Freebooter | Creature | Human Pirate | When Greedy Freebooter dies, scry 1 and create a Treasure token. (To scry 1, look at the top card of your library. You may put that card on the bottom. A Treasure token is an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.") | David Palumbo

Goblin Tomb Raider | Creature | Goblin Pirate | As long as you control an artifact, Goblin Tomb Raider gets +1/+0 and has haste. | Kevin Sidharta

Seeker of Sunlight | Creature | Merfolk Scout | {2}{G}: Seeker of Sunlight explores. Activate only as a sorcery. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.) | Randy Vargas