You may exert Trueheart Twins as it attacks. (It won't untap during your next untap step.)
Whenever you exert a creature, creatures you control get +1/+0 until end of turn.

• Number: 153
• Rarity: U
• Power: 4
• Toughness: 4
• Type: Creature
• Subtype: Jackal Warrior
• Mana cost: 4R
• Color: Red
• Artist: Matt Stewart