If you can play Smothering Tithe, youre probably going to pick that first, but I think Id hedge on Monologue Tax over Tempting Contract
Keep an eye out for cards like Snuff Out and Dismember that let you pay enough life to trigger Yshtola
Helm of the Ghastlord does the same thing but with added discard, in case youre worried about disruption
Quantity is not always mean quality: after creating two Zombie Armies instead of one due to Anointed Procession effect, you have to choose one Army, which will have counters and another one will be put into the graveyard very soon because of lack of additional effects
Galufs Final Act Rating: 1/10 For this to work, you need to nearly be or already be winning a combat
This is insanely powerful in tempo decks and is far more castable than either of the other free counterspells weve looked at