Green Ward [Collectors' Edition] Portal Second Age The bidding ends if the

The bidding ends if the high bid stands

each other non-Aura enchantment you control is a creature in addition to its other types and has base power and base toughness each equal to its mana value

I'd prefer the former

Set: Planar Chaos Type: Creature — Sliver Rarity: Common Cost: {1}{W} All Sliver creatures get +1/+1

(You may sacrifice three Islands in addition to any other costs as you cast this spell

Green Ward [Collectors' Edition] Portal Second Age The bidding ends if theSet: Collectors' Edition Type: Enchantment Aura Rarity: Uncommon Cost: {W} Enchant creature Enchanted creature has protection from green. This effect doesn't remove Green Ward.