it keeps the second ability after changing, but it would lose the first ability and the second one doesn't work without the first.
it would work if it was all one ability: "Play with the top card of your library revealed. As long as that card is a permanent card, Amorphous Mass is a copy of it, except it still has this ability."
of course, if the top card is an Aura or a planeswalker, the Mass will immediately go to graveyard. would change "permanent card" to "artifact, creature or land." this also makes sense flavorwise, since shapeshifting into an abstract concept doesn't make much sense but most enchantments are abstract concepts.
Oh yeah, I didn't think of that consequence. I'll update the card in my file to only look at artifacts, creatures or lands. It's amazing how simple concepts are always so difficult to explain in rules text.
Amorphous Mass5
Artifact (MR)
Play with the top card of your library revealed.
If the top card of your library is a permanent card, Amorphous Mass is a copy of that card, but maintains this ability.
Manifest Density3GG
Sorcery (R)
Manifest the top card of your library until you control as many creatures as the player who controls the most creatures.
Weighted Scales3
Artifact (R)
Whenever an opponent gains control of a permanent you control, you may gain control of up to two target permanents that player controls. When dealing with an Orzhov broker, it's better that they have their thumb on the scale than your head on it.
Oro, Curator of the Eternal1W
Legendary Creature - Human Cleric : Target creature you control becomes an enchantment. It is no longer a creature and has no power and toughness. (This effect lasts indefinitely.)
At the beginning of your upkeep, gain 1 life for each enchantment you control.
1/2
Naga KnockUB
Enchantment - Aura (C)
Enchant creature
Enchanted creature gets -2/-2.
At the beginning of your upkeep, return enchanted creature to its owner's hand. "Who's there?"
Ancestor's Resolve1G
Sorcery (C)
Put a +1/+1 counter on target creature. Ferocious - At the beginning of your upkeep, as long as you control a creature with power 4 or greater, return Ancestor's Resolve from your graveyard to your hand.
Flame MasteryR
Instant (C)
Up to one target creature gains Prowess until end of turn.
Add RR to your mana pool. Training may take years, but becoming a master requires only a moment.
Angry Angler3U
Creature - Fish (U)
Islandwalk
At the beginning of each opponent's precombat main phase, add 1 to that player's mana pool.
Whenever an opponent spends mana from Angry Angler, put two +1/+1 counters on Angry Angler. Be careful what you fish for.
3/1
Thunderhoof Rumbler1RG
Creature - Elephant (U)
When Thunderhoof Rumbler enters the battlefield, target land becomes a 4/4 creature until end of turn.
3/3
Skinthief 2UU
Creature - Illusion Rogue (U)
As Skinthief enters the battlefield, manifest the top card of target opponent's library.
1/1
Oh yeah, I didn't think of that consequence. I'll update the card in my file to only look at artifacts, creatures or lands. It's amazing how simple concepts are always so difficult to explain in rules text.
Qarsi Stag 1G
Creature - Elk (C)
When Qarsi Stag dies, gain 2 life.
When Qarsi Stag becomes exiled from anywhere, gain 2 life.
2/1
Amorphous Mass 5
Artifact (MR)
Play with the top card of your library revealed.
If the top card of your library is a permanent card, Amorphous Mass is a copy of that card, but maintains this ability.
Manifest Density 3GG
Sorcery (R)
Manifest the top card of your library until you control as many creatures as the player who controls the most creatures.
Weighted Scales 3
Artifact (R)
Whenever an opponent gains control of a permanent you control, you may gain control of up to two target permanents that player controls.
When dealing with an Orzhov broker, it's better that they have their thumb on the scale than your head on it.
Kjeldoran Light-Guard 1B
Creature - Skeleton Knight (U)
1B: Regenerate target creature blocking or blocked by a white creature.
2/1
Oro, Curator of the Eternal 1W
Legendary Creature - Human Cleric
At the beginning of your upkeep, gain 1 life for each enchantment you control.
1/2
Naga Knock UB
Enchantment - Aura (C)
Enchant creature
Enchanted creature gets -2/-2.
At the beginning of your upkeep, return enchanted creature to its owner's hand.
"Who's there?"
Guild Upheaval
Sorcery (U)
Destroy target Plains, Island, or Forest.
No matter where you go in Ravnica, a dispute is sure to follow.
Ancestor's Resolve 1G
Sorcery (C)
Put a +1/+1 counter on target creature.
Ferocious - At the beginning of your upkeep, as long as you control a creature with power 4 or greater, return Ancestor's Resolve from your graveyard to your hand.
Flame Mastery R
Instant (C)
Up to one target creature gains Prowess until end of turn.
Add RR to your mana pool.
Training may take years, but becoming a master requires only a moment.
Compost 1BG
Enchantment - Aura (C)
Enchanted creature gets -3/-3.
When enchanted creature dies, draw cards equal to it's power.
Angry Angler 3U
Creature - Fish (U)
Islandwalk
At the beginning of each opponent's precombat main phase, add 1 to that player's mana pool.
Whenever an opponent spends mana from Angry Angler, put two +1/+1 counters on Angry Angler.
Be careful what you fish for.
3/1
Thunderhoof Rumbler 1RG
Creature - Elephant (U)
When Thunderhoof Rumbler enters the battlefield, target land becomes a 4/4 creature until end of turn.
3/3