Personally I just use MS Paint for resizing images.
... does that work on a Mac?
I myself use Lunapic's scale and simple crop features. Followed by using a personal discord server to copy an image in the scale feature and post it there.
Both of these fetures are in edit, though you need to use File>Upload multiple Images for weblinks.
Also, congrats on being purple. (Your region effects are a bit silly, but put a lot of focus on star-gen for drawpower.)
Made another edit to the Invader Guardians to put a cap on it's damage negation. So you can either one-shot it or survive it's attack to deal damage.(Though if your original attack is lower, you still don't deal damage if you die.)
Of note, you might want to read the latest matches down. Right now they have 2 cards of note. A field nuke that deals 4 damage to all cards, and a monster that banishes 3 targets to gain their combined stats. Also Pacifist Gunslinger Waifu, which has 10 attack but can't really kill anything, just cause damage.
A search card might be very nice if you can manage it. Though for Thorn wall you have two routes. An equip-type that confers stats, or a terrain type with hearts that has an effect for the field. (That being dealing damage when an opponent attacks.) The latter runs into the issue of needing to be a star card to have enough HP to not get nuked.