The distribution between the alternate art and the global art is equal according to WotC, so you have a higher chance of getting them in those packs
[108] The new frame design aimed to improve contrast and readability using black type instead of the previous white, a new font, and partitioned areas for the name, card type, and power and toughness
So poison gives one counter, generally speaking, irrelevant of damage
Wizards of the Coast arent shy when it comes to admitting that the March of the Machine: The Aftermath set was a flop
Battles may eventually get combined with other card types simultaneously, but their current Siege form simply transforms from Battles into another card type on the back of the card, with only the front-facing Battle counting towards Delirium in your graveyard