Polygoyf

You choose whether each token is attacking the player or a planeswalker they control as the token is created.

Each token copies exactly what was printed on the original creature and nothing else. It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on.

The token creatures all enter the battlefield at the same time.

If the defending player is your only opponent, no tokens are put onto the battlefield.

The ability that defines Polygoyf's power and toughness counts card types, not cards. If the only card in all graveyards is a single artifact creature card, Polygoyf will be a 2/3. If the cards in all graveyards are ten artifact cards and ten creature cards, Polygoyf will still be a 2/3.

Card types that can appear on cards in a graveyard are artifact, battle, creature, enchantment, instant, kindred, land, planeswalker, and sorcery. Legendary, basic, and snow are supertypes, not card types; Lhurgoyf, Forest, and Siege are subtypes, not card types.