This symbol notates which set the card you are looking at came from, and the color tells you what its rarity is
Silklash Spider Ah yes, my favorite Spider of all time
Mightform Harmonizer Whelp, heres another landfall card that can just end games
I really like this card, for what its worth
While theres a lot of synergy here, the cards are mostly strong independently, and the deck is designed to play a fair, interactive game that just happens to be able to gain infinite life with Urza and the Thopter Foundry / Sword of the Meek Combo, but mostly Urza, Oko, and Emry are all amazing standalone cards that require fairly different answers
Deep-Cavern Bat The Lost Caverns of Ixalan s Deep-Cavern Bat is one of the best black cards in many formats including Standard and Pioneer, and even showed up in MTG Arenas Starter Deck Duel event for a time