Theros

Dauntless Onslaught | Instant | | Up to two target creatures each get +2/+2 until end of turn. | Peter Mohrbacher

Dissolve | Instant | | Counter target spell. Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.) | Wesley Burt

Triton Fortune Hunter | Creature | Merfolk Soldier | Heroic — Whenever you cast a spell that targets Triton Fortune Hunter, draw a card. | Clint Cearley

Mogis's Marauder | Creature | Human Berserker | When Mogis's Marauder enters the battlefield, up to X target creatures each gain intimidate and haste until end of turn, where X is your devotion to black. (A creature with intimidate can't be blocked except by artifact creatures and/or creatures that share a color with it. Each {B} in the mana costs of permanents you control counts toward your devotion to black.) | Chase Stone

Flamespeaker Adept | Creature | Human Shaman | Whenever you scry, Flamespeaker Adept gets +2/+0 and gains first strike until end of turn. | Lucas Graciano

Peak Eruption | Sorcery | | Destroy target Mountain. Peak Eruption deals 3 damage to that land's controller. | Adam Paquette

Satyr Piper | Creature | Satyr Rogue | {3}{G}: Target creature must be blocked this turn if able. | Christopher Moeller

Chronicler of Heroes | Creature | Centaur Wizard | When Chronicler of Heroes enters the battlefield, draw a card if you control a creature with a +1/+1 counter on it. | John Stanko

Spellheart Chimera | Creature | Chimera | Flying, trample Spellheart Chimera's power is equal to the number of instant and sorcery cards in your graveyard. | Svetlin Velinov

Burnished Hart | Artifact Creature | Elk | {3}, Sacrifice Burnished Hart: Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle. | Yeong-Hao Han