It was a key card in dealing with the control decks of the meta because it couldn't be countered and was hexproof
However, there are better cards that offer similar effects with lower mana costs, such as Impact Tremors or Purphoros, God of the Forge, making All Will Be One less desirable for competitive play unless in a specific theme or casual setting where the flavor of the card is valued more than its efficiency
For example, if you control a 2/2 Sharp-Eyed Rookie and two 3/3 creatures enter the battlefield, Sharp-Eyed Rookie's triggered ability will trigger twice
Kaheera, the Orphanguard 10
Theres also a large token sub-theme: Grist, the Hunger TideGrist, the Hunger Tide Giant AdephageGiant Adephage Formless GenesisFormless Genesis We got some really fun new cards in this deck, especially Shriekwood DevourerShriekwood Devourer and the backup commander Rendmaw, Creaking NestRendmaw, Creaking Nest
Make it unblockable, cast something huge