Original Border (1993-2003): 1.9 1.53 in (48.5 39 mm) Modern Border (2003-2014): 2.06 1.52 in (52.5 38.5 mm) Postmodern Border (2014-Present): 2.09 1.54 in (53 39 mm) If you are designing a "retro" style proxy, ensure your art box dimensions match the era you are emulating
(Orange you glad I didnt say Winter is coming?) The snow card supertype in Magic really makes me feel at home
Although the creature card you put onto the battlefield is an attacking creature, it was never declared as an attacking creature
Also, there is the calendar icon on the left side of each row, which will let you add the event to your calendar
The way challenging works is a ready (untapped) character exerts and chooses an opposing exerted character to challenge, and then both cards compare their strength (attack) and willpower (defense) values to each other (meaning the attacker automatically gets hit back by the defender)
There are also other cards like Grafted Exoskeleton or even Prosthetic Injector, equip it to Tekuthal, Inquiry Dominus which flies, and start proliferating from there