(11/10/2020) Although the tokens created by Najeela's first ability are attacking, they were never declared as attacking creatures (for the purposes of abilities that trigger whenever a creature attacks, for example)
Rift returns all NON-land permanents to their owners hands, but since your creatures ARE lands the table dies anyway
Cavern of Souls first debuted in Avacyn Restored and has seen a small handful of reprints since
Thanks to the three-year rotation, Wizards is planning to develop archetypes over time, similarly to how blocks did things
Players can attack with multiple creatures at once
In a normal situation, the Wurm would deal 15 damage to the Colossus, and with only 11 toughness the Colossuss health would be reduced to zero, sending it to the graveyard