Monastery Swiftspear

Haste
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Lorehold Pledgemage

First strike
Magecraft — Whenever you cast or copy an instant or sorcery spell, Lorehold Pledgemage gets +1/+0 until end of turn.

Relic Sloth

Vigilance
Menace (This creature can't be blocked except by two or more creatures.)

Boros Garrison

Boros Garrison enters tapped.
When Boros Garrison enters, return a land you control to its owner's hand.
{T}: Add {R}{W}.

Hammer Dropper

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)

Alpine Meadow

({T}: Add {R} or {W}.)
Alpine Meadow enters tapped.

Looming Spires

Looming Spires enters tapped.
When Looming Spires enters, target creature gets +1/+1 and gains first strike until end of turn.
{T}: Add {R}.

Wings of the Cosmos

Target creature gets +1/+3 and gains flying until end of turn. Untap it.

Dragon Bell Monk

Vigilance
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Plains

Wrenn's Resolve

Exile the top two cards of your library. Until the end of your next turn, you may play those cards.

Rustvale Bridge

Rustvale Bridge enters tapped.
Indestructible
{T}: Add {R} or {W}.

Mountain

Assault Strobe

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

Reckless Impulse

Battlegate Mimic

Whenever you cast a spell that's both red and white, Battlegate Mimic has base power and toughness 4/2 until end of turn and gains first strike until end of turn.