Those counters are removed in pairs, essentially annihilating each other until only one kind of counter remains
When a German Magic player started his collection back in 1995, it began with two Limited Edition starter decks where he pulled two dual lands--Taiga and Volcanic Island
If any of your creatures are both colors, they get a +2/+2 buff, which includes the 1/1 Worms created on your upkeep
But does it always have to be that way
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Getting mana reduction and making your creatures cantrip makes this blue creature a powerful draw engine