Caltrops [Urza's Destiny] Pauper −5: Artifacts you control become

−5: Artifacts you control become artifact creatures with base power and toughness 5/5 until end of turn

you may play up to one permanent card of each permanent type from your graveyard

Set: Judge Gift Cards 2014 Type: Basic Land — Forest Rarity: Rare ({T}: Add {G}

Set: Limited Edition Beta Type: Sorcery Common Cost: {X}{R} This spell costs {1} more to cast for each target beyond the first

Set: Revised Edition Type: Land — Mountain Forest Rare Cost: ({T}: Add {R} or {G}

Caltrops [Urza's Destiny] Pauper −5: Artifacts you control becomeSet: Urza's Destiny Type: Artifact Uncommon Cost: {3} Whenever a creature attacks, Caltrops deals 1 damage to it. Toward the end, Gatha struggled to keep his experiments in and his patrons out.