Arachnoform

Two mana in green buys +2/+2 and reach, a rate that reads as a permanent combat trick and nothing more: the buff line is deliberately unremarkable, and reading it defensively (a ground creature that suddenly answers fliers) is the least of what this Aura does. The clause that matters is the type-granting one. Making a creature every creature type turns a single body into a legal target, a lord-recipient, and sacrifice fodder for every type-matters effect on the board at once: one mana dork counts as Elf and Goblin and Zombie and Dragon simultaneously, satisfying tribal payoffs that normally demand you actually run the type. The design swaps the specificity tribal shells usually require for total coverage, which is why the numbers are the dullest text here and the type line is the strange, load-bearing one. That coverage is not free. Making a creature every type also hands opponents a target for every type-hosing removal spell and hatebear that names one, so the same clause that makes the creature glue in a tribal deck makes it a liability against the right hate. It is an unusual stat-boosting Aura where the +2/+2 decides nothing and the "every creature type" text alone determines whether the card is filler in a fair green deck or the connective tissue in a tribal one.