While Atraxa's combat abilities are nothing to scoff it, it's best known for its ability that allows its controller to proliferate at the beginning of their end step
Daybound/Nightbound imposes a permanent game change la the Monarch
With the Bellows Lizard, your creature even has an extra ability and lets you pump your Lizard up for two mana
Nibiru arrives to demolish everything to both actively hurt the opponent in ways no single card can
For two mana you can choose to activate one of its effects, choosing between gaining life, dealing damage to flying creatures, putting a +1/+1 token on a creature, or bringing cards out of your graveyard to put them back into your library
MTG 's early metagame was dominated by combo decks using burn spells to kill their opponent in one turn, or stax decks with disruptive strategies to prevent their opponent from playing cards