3-6 Uncommon cards
Look for efficient draw engines that fit your Commanders strategy
If Auron is not present on the Field at the point when damage is resolved, no swapping will occur and you will take damage
The former will let you sacrifice any snow land you might control but costs you two mana to do so while the latter is more limited in its use of land-age but cheaper on the cost
In fact the printing of Unholy Heat (and to an extent Solitude) has mostly pushed out cards like Tarmogoyf out of the format, as the removal in the format is now so efficient that creatures either need to be one-mana, so you trade at an even level (Dragons Rage Channeler and Ragavan, Nimble Pilferer), too large to be killed by Unholy Heat (Deaths Shadow and Murktide Regent) or generate immediate value upon being played (Solitude, Fury and Omnath, Locus of Creation)
Unlike draft boosters, collector's have a significantly higher number of rare and mythic rare cards, with a guaranteed five in each pack