2-Mana Removal When it comes to cheap, reliable answers, Infernal Grasp and Go for the Throat are two of blacks best options

Section 27 Summary Input: One playing of Skyshroud Poacher Output: Lots of reuse of Skyshroud Archer Layer count: For each Bloodbond March, for each Clash of Realities on a new Mimic Vat, for each Guilty Conscience on Mimic Vat, for each Rite of Passage putting counters on Mimic Vat, for each Doubling Season on the Rite of Passage counters added to Mimic Vat, for each Rings of Brighthearth on Sinking Feeling's ability while it's attached to Mimic Vat, for each Rings of Brighthearth on Mimic Vat's ability, for each Clash of Realities on Skyshroud Poacher, for each Guilty Conscience on Skyshroud Poacher, for each Rite of Passage putting counters on Skyshroud Poacher, for each Doubling Season on the Rite of Passage counters added to Skyshroud Poacher, for each Rings of Brighthearth on Sinking Feeling's ability while it's attached to Skyshroud Poacher, for each Rings of Brighthearth on Skyshroud Poacher's ability...13

It doesn't prevent abilities from being activated or from triggering later in the turn, and it has no effect on static abilities
More Expensive You could go with popular cards like Arwen, Weaver of Hope and Aftermath Analyst but those don't feel maximized with Lathril
However, in order to get some of the harder wins, you need to know how your opponents are going to try and stop you, and how to plan ahead for those scenarios