Time Vault Coldsnap Elves you control have "Whenever

Elves you control have "Whenever this creature becomes tapped during your turn

This creature has first strike during your turn

Put Seasons Past on the bottom of its owner's library

Treat phased-out permanents and anything attached to them as though they don't exist until their controller's next turn

Then each creature that isn't an Insect

Time Vault Coldsnap Elves you control have "WheneverThis artifact enters tapped. This artifact doesn't untap during your untap step. If you would begin your turn while this artifact is tapped, you may skip that turn instead. If you do, untap this artifact. {T}: Take an extra turn after this one.