In the multiplayer variant two-headed giant, you and your teammate share a combat phase and choose attacking creatures at the same time. These attacking creatures do not attack individual players, but the opposing team. The defending team can then use their creatures to block these attacking creatures. If an attacking creatures is unblocked or able to deal damage to a defending player due to Trample, it when combat damage is assigned the controller of the attacking creatures chooses which defending player it will deal damage to.
Because creatures attack the opposing team in two-headed giant, a creature with a conditional evasion ability like Swampwalk will be unblockable if either player on the opposing team controls a swamp.
Today’s Rules Tip was submitted by Fabian Peck, a level 3 judge from Melbourne, Australia.