Se blocco un [card]Groundbreaker[/card] con una [card]Spectral Lynx[/card] passano i danni da travolgere? Se si quanti?

Si, passano 5 danni, leggi qui:

502.9d - Assigning damage from a creature with trample considers only the actual toughness of a blocking creature, not any abilities or effects that might change the final amount of damage dealt. [CompRules 2003/07/01]
Example: A 6/6 green creature with trample is blocked by a 2/2 creature with protection from green. The attacking creature's controller must assign at least 2 damage to the blocker, even though that damage will be prevented by the blocker's protection ability. The attacking creature's controller can then choose to assign the rest of the damage to the defending player. [CompRules 2003/10/01]

Puoi assegnare alla Lince i danni per ucciderla (virtualmente, visto che poi li previene) e poi quelli per il giocatore in difesa.

Ciao