mtg shapeshifter cards (024) // Shapeshifter (028) Double-Sided Token [Commander Legends: Battle for Baldur's Gate Tokens] Lightly Played The same is true for first strike Shapeshifter - MTG Wiki

But there are other spots where you want different answers

Secure the Wastes can produce a bunch of unexpected blockers out of nowhere, ones that reap the benefits of any Warrior-specific payoffs you might have lying around

Here are all of the Background Enchantments by color: White The White Enchantments mostly help with combat

Daxos of Meletis Human and soldier are solid creature types to have on an aggressive card in white

Hexcatcher having flash and turning all of your Merfolk into Cursecatcher is going to lead to a lot of blowouts for unsuspecting opponents

Phyrexian Arena looks like it will be the business, but its no match for blue's best enchantment, Rhystic Study