I use all the right gear like a magnifying lamp or a jewelers loupe, to get my eyes as close to the cards as possible
These cards just increases the mana cost of your opponent's spells, and while Thalia, Guardian of Thraben is a symmetrical effect (it affects you too), it is an extremely good card to drop in Turn 1 or 2 while your opponents are trying to play mana rocks or ramp their lands
This card can be obtained via the Celebrations Ultra Premium Collection, and as those wont likely be reprinted, this card should hold up value overtime (despite the current downward trend in value)
That said, in a token creation deck, especially with cards that generate creature tokens each turn (think Tendershoot Dryad), Octomancer becomes a massive problem very quickly
PSA Slabs, Graded Card Slabs
PP Effect % Dream Eater 100 100 15 -- Details The user eats the dreams of a sleeping target