Here to Help

Q: #Riftbound QOTD: Dragon Roost is at play. I control the other battlefield with a hidden Here to Help. If I play Here to Help and I pay the 2 additional cost for Dragon Roost, am I allowed to play a Dragon there? If yes, why? If not, is the 2 wasted?

A: Well, I was hoping the Radiance rule update would come out today before answering. But 🥲

Don't know. There are 2 potential explanations: Not allowed - (811.1.d.3.) forces us to play units at the battlefield it was hidden from. If we try to choose Dragon Roost, the game would force us to unwound the decision and we would get our 2 back. Allowed - Hidden restrictions don't use "can't" (just "must"), so an argument could be made (via the Vendetta FAQ) that Dragon Roost becomes a viable option.

Dragon Roost is at play. I control the other battlefield with a hidden Here to Help. If I play Here to Help and I pay the 2P additional cost for Dragon Roost, am I allowed to play a Dragon there? If yes, why? If not, is the 2P wasted?

No. The 2P would be refunded.

Dragon Roost is NOT a replacement effect. It only adds to the valid locations that the unit can play to (355.2.b.). However, because Here to Help played from hidden, the chosen dragon MUST be played to that battlefield (811.1.d.3.).

By the time we get to step 5), we see this is a play that would be illegal (358.3.), This should unwind the process of play for the Here to Help dragon unit and refund the 2P.

Arguably because the opponent has not revealed any new information, a rewind could go all the way back to when Here to Help is resolving where the player could play another unit. But that’s a can of worms for another day.