Assault Strobe

Target creature gains double strike until end of turn. (It deals both first-strike and regular combat damage.)

Ornithopter

River Boa

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
{G}: Regenerate River Boa.

Mutagenic Growth

({G/P} can be paid with either {G} or 2 life.)
Target creature gets +2/+2 until end of turn.

Mountain

Madcap Skills

Enchant creature
Enchanted creature gets +3/+0 and has menace.

Groundswell

Target creature gets +2/+2 until end of turn.
Landfall — If you had a land enter the battlefield under your control this turn, that creature gets +4/+4 until end of turn instead.

Memnite

Glistener Elf

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

Rubblebelt Maaka

Bloodrush — {R}, Discard Rubblebelt Maaka: Target attacking creature gets +3/+3 until end of turn.

Goblin Mountaineer

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)

Forest

Spire Tracer

Spire Tracer can't be blocked except by creatures with flying or reach.

Titan's Strength

Target creature gets +3/+1 until end of turn. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Giant Growth

Target creature gets +3/+3 until end of turn.

Jukai Messenger

Forestwalk (This creature can't be blocked as long as defending player controls a Forest.)

Welding Jar

Sacrifice Welding Jar: Regenerate target artifact.

Mishra's Bauble

{T}, Sacrifice Mishra's Bauble: Look at the top card of target player's library. Draw a card at the beginning of the next turn's upkeep.