A lot of returning mechanics in Universes Beyond is about things that fit the flavor super well
Show and Tell hands out a free cast to the whole table, allowing each player to substantially increase their board presence, provided they have access to a Land, Artifact, Enchantment, or Creature in their hand
Certainly any magics your foes had prepared to overwhelm you would still be in effect, so if that were the case, all you do is reduce the base potency of their creatures
If a permanent has the phasing keyword ability, it alternates between phased in and phased out every turn
Kodama of the West Tree, for example, grants modified creatures trample and also allows you to grab a land from your deck and put it into play when a modified creature you control does combat damage to a player