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'Other enchantments have "At the beginning of your upkeep, sacrifice this enchantment unless you pay {2}."
Trainer - Pokémon Tool Attach Mysterious Shard to 1 of your Pokémon (excluding Pokémon-ex) that doesn't already have a Pokémon Tool attached to it. If the Pokémon Mysterious Shard is...
'Gain control of target Aura that's attached to a permanent. Attach it to another permanent it can enchant.
'Sacrifice a land: Destroy target enchantment.
'Destroy target enchantment. Create X 1/1 green Saproling creature tokens, where X is that enchantment's mana value.
'{W}, Sacrifice an enchantment: Destroy target enchantment.
{3}{U}{U}: Counter target enchantment spell.
'Flying
Whenever an artifact creature you control deals combat damage to a player, you may create a 1/1 blue Thopter artifact creature token with flying.
'Target player sacrifices an attacking creature of their choice. Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets...
'Defender, flying Cumulative upkeep—An opponent gains 1 life. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost...
'Target player sacrifices an attacking creature of their choice. Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets...
'({W/P} can be paid with either {W} or 2 life.)
Marrow Shards deals 1 damage to each attacking creature.