Saying 'up to' would help the players that do not visit the forums. (if it were implemented)
So
+2|3 Turns of Dim Shield (the 19th-36th turns to be exact)
+1 turn of Sundial
+2?|3? Turns of Shard of Sacrifice (again enough to last most of a game)
On that note: Dim Shield/Shard of Sac/Sundial decks might change the metagame enabling balanced longer Dim Shield chains.