AI eagerly evokes Solitude targeting creatures with ward without mana to pay for ward cost

**Describe the bug**

I have noticed in matches against AI opponents playing Solitude where if I have a creature with ward on the board, it is very eager to evoke it and target said creature for removal, even if it doesn't have the mana to pay for the ward cost, effectively "throwing away" their Solitude in the process for no upside.

**To Reproduce**

1. Get a creature with ward on the board
2. AI opponent will evoke solitude targeting it, even if it doesn't have the mana to pay for ward

**Expected behavior**

AI opponent should only try this move if it has the mana to pay for the creature's ward cost. This doesn't happen with other spot removal spells like Swords to Plowshares, Path to Exile, etc, etc.

**Desktop (please complete the following information):**
- OS: Windows
- Version: 1.6.62-SNAPSHOT-04-21