Defender; reach (This creature can block creatures with flying.)
Whenever Aether Membrane blocks a creature, return that creature to its owner's hand at end of combat.
When Aethersnipe enters the battlefield, return target nonland permanent to its owner's hand.
Evoke (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters the battlefield.)
Flying, vigilance, trample
As Archon of Valor's Reach enters the battlefield, choose artifact, enchantment, instant, sorcery, or planeswalker.
Players can't cast spells of the chosen type.
When Avenger of Zendikar enters the battlefield, create a 0/1 green Plant creature token for each land you control.
Landfall — Whenever a land enters the battlefield under your control, you may put a +1/+1 counter on each Plant creature you control.
Flash (You may cast this spell any time you could cast an instant.)
First strike (This creature deals combat damage before creatures without first strike.)
"Through the haze of battle I saw the glint of sun on golden mane, the sheen of glory clad in mail, and I dropped my sword and wept at the idiocy of war."
—Dravin, Gruul deserter
Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)
: Boros Challenger gets +1/+1 until end of turn.
Instant and sorcery spells you control have rebound. (Exile the spell as it resolves if you cast it from your hand. At the beginning of your next upkeep, you may cast that card from exile without paying its mana cost.)
Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)
Choose a counter on target permanent or suspended card. Remove that counter from that permanent or card or put another of those counters on it.