Roaming Throne with Terra Herald of Hope - Revive trigger gets triggered twice instead of once

Apparently, the revive trigger (with the "may pay 2") should not be seen by the Roaming Throne (per [this thread](https://www.reddit.com/r/mtgrules/comments/1mbeees/reflexive_triggers_terra_herald_of_hope_and/)), but in XMage I can use it twice.

I think it works that way (incorrectly) for many other reflexive triggers.

Start by reproducing the Roaming Throne and Terra Herald of Hope interaction described in the issue, then trace how the “may pay 2” revive trigger is handled. Check whether the same behavior occurs with other reflexive triggers. Done means the revive trigger is seen once rather than twice, with regression coverage for this interaction.

Written by the indexing model from the issue text.