AI chooses wrong targets for Might of Old Krosa

**Describe the bug**
AI casts Might of Old Krosa and chooses a creature without unblockable and/or infect instead to choose other creature that unblockable and/or has infect. Or AI chooses mana dork for Might of Old Krosa and then tap it. It's a waste of a spell.

**To Reproduce**
Steps to reproduce the behavior:
1. AI has Noble Hierarch and Blighted Agent
2. AI has Might of Old Krosa in hand
3. AI casts Might of Old Krosa and targets Noble Hierarch
4. (in addition) AI tap Noble Hierarch for mana.

**Expected behavior**
When AI casts Might of Old Krosa, it should firstly choose a creature that unblockable and/or has infect. And Might of Old Krosa should be used for attack, block or for creature's protection.

**Additional context**
Similar with #4434
@Hanmac, can you add AI label, keep label and assign Agetian for all of this requests (https://github.com/Card-Forge/forge/issues/created_by/MorihiroS) (so you don't have to do it every two/three days)?

**Desktop**
OS: Windows 10
Java Version: 1.8.0_202-b08
Forge Version: 1.6.60-SNAPSHOT-12.22

**Screenshots**