Rule of the Shardbearers

You may only have one Shardbearer on the field at a time (Godrick, Rennala, Radahn, Rykard, Morgott, Mogh and Malenia are all Shardbearers.
If you would play a Shardbearer and have it enter its second phase, if it dies a second
time in its second phase, remove that card
from the game.