Collectible Card Game Headquarters

Describe the Bug:
Fiend of the Shadows regenerate ability lets you sacrifice any creature and also lands possibly any permanent.

Which card did behave improperly?
Fiend of the Shadows

Which update are you using? (date, name)Which type? (duel, gauntlet, sealed deck)
Manalink dev 778ccb5 version - duel

What exactly should be the correct behavior/interaction?
sacrifice a Human: regenerate Fiend of the Shadows.

Are any other cards possibly affected by this bug?
-

1- I had this error pre-combat when AI was thinking to attack with Fiend of the Shadows and I didn't have a card in hand.

| Open

bad parameters
get_card_instance(0, -1)
0: 0x0247CE18
1: 0x024A4FDE
2: 0x024A723F
3: 0x00410FFB
4: 0x024A6D49
5: 0x022F73B1
6: 0x024EC735
7: 0x024D745D
8: 0x024D7FC4
9: 0x024D8376
10: 0x004367C3
11: 0x024D84B0
12: 0x00475CBF
13: 0x024D76FF
14: 0x024D7D97
15: 0x004371B4
16: 0x004771F6
17: 0x004B361F
18: 0x0043CD3D
19: 0x004399BD
20: 0x0047902C
21: 0x004946E9
22: 0x7C80B729

2- Another bug that happens when Fiend of the Shadows deals damage to opponent and opponent has 0 cards in hand then no matter which player was damaged all cards from human's library get's disappeared from game.
3- Fiend of the Shadows works differently than others it seems to produce too many legacy cards. Every time a card is exiled with it you get a legacy that says it exiles a card you can play which stays for ever and seems unnecessary and 1 that is needed and names the exiled card.

Fixed can regenerate for any permanent in commit eadc6764. Fixed issue when deal damage to player with 0 cards in hand in commit 3e4ae8c8.