Caves of Koilos [Apocalypse] Urza's Legacy Counters can't be put on

Counters can't be put on artifacts

Set: Portal Three Kingdoms Type: Sorcery Rarity: Uncommon Cost: {1}{R} Rockslide Ambush deals damage to target creature equal to the number of Mountains you control

Set: Mirrodin Type: Artifact — Equipment Rarity: Rare Cost: {2} Equipped creature gets +2/+2

It's hearing the clatter of bone on stone and knowing the bones are yours

Set: Portal Three Kingdoms Type: Creature — Human Advisor Rarity: Uncommon Cost: {2}{U} When Council of Advisors enters the battlefield

Caves of Koilos [Apocalypse] Urza's Legacy Counters can't be put onSet: Apocalypse Type: Land Rarity: Rare {T}: Add {C}. {T}: Add {W} or {B}. Caves of Koilos deals 1 damage to you.