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While it stifles your mana development, that won't matter if you can kill your opponent in just five quick attack phases

In these decks that have a lot of very-low-investment artifact generation, Oko can function as a supercharged, cheaper Gideon, Ally of Zendikar that gains loyalty to make 3/3s every turn, except the 3/3s can attack right away (because youre using the ability on artifacts that were already on the battlefield) and the Oko gains loyalty and costs less mana

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Should you ever get in with the Tiger, you get to open your stocking and play with all the sweet cards that are contained within it