Assigning blockers with >10 attackers/blockers becomes a nightmare with pop ups of the creature hovered over blocking out most of the screen which causes big delays in assigning blockers, and can sometimes cancel the assigning of the current blocker.

Some possible solutions:

1) Add feature/button to sort board by blocked/unblocked
2) Button/shortcut to toggle off card previews
3) Beyond 10 blockers, replace spaghetti of blocking arrows with a system similar to assigning mass-blockers IRL (placing assigned blockers opposite an attacker)