Elvish Vanguard [Onslaught] Siren You may choose not to

You may choose not to untap Sand Silos during your untap step

Set: Scars of Mirrodin Type: Artifact Rarity: Rare Cost: {4} Imprint — When Prototype Portal enters the battlefield

Set: Modern Masters Type: Land Rarity: Rare Whenever City of Brass becomes tapped

including this card

Set: Magic Origins Promos Type: Legendary Creature — Human Artificer Rarity: Rare Cost: {2}{R}{R} When Pia and Kiran Nalaar enters the battlefield

Elvish Vanguard [Onslaught] Siren You may choose not toSet: Onslaught Type: Creature Elf Warrior Rarity: Rare Cost: {1}{G} Whenever another Elf enters the battlefield, put a +1 +1 counter on Elvish Vanguard. "Our lives are woven together like the trees' branches over our heads, forming a canopy that protects us all."