Ben 10: choose the Alien for the moment

Ben Tennyson, Omnitrix Wielder leads a Temur (green/blue/red) Commander deck built around the temporary arrival of different Aliens. Tap Ben to use Hero Time: put an Alien card from your hand onto the battlefield, give it haste, then return it to your hand when it times out at the beginning of the next end step. The Ben 10 cast becomes a menu of entry effects and combat roles, with the choice in your hand shaping each activation.

• HERO TIME: Tap Ben Tennyson, Omnitrix Wielder to put an Alien card from your hand onto the battlefield with haste. At the beginning of the next end step, that creature times out and returns to your hand.
• REFINE THE HAND: Whenever an Alien you control enters, Ben makes you draw a card, then discard a card. The trigger helps select cards rather than increasing your hand size by itself.
• A TOOL FOR THE BOARD: Heatblast deals 2 damage to any target on entry. Four Arms fights up to one opposing creature on entry, while Ripjaws returns a target opposing creature to its owner's hand.
• LARGER ANSWERS: Way Big destroys a target opposing nonland permanent when it enters. Alien X returns up to two opposing nonland permanents to their owners' hands on entry and has flying and indestructible.

Use the arrival, then prepare the next selection

An Alien brought in by Hero Time is available for its entry effect and can use haste during the turn. If it remains on the battlefield for the delayed return, you regain the card in hand and can choose it again for a later activation. The timeout belongs to the next end step, so activation timing determines how long you have to use the creature. Ben himself must be able to pay his tap cost; the haste granted to the Alien does not grant haste to Ben.

Humungousaur strengthens your other creatures and gives them trample for the turn when it enters, offering a team-oriented choice. XLR8 cannot be blocked and draws on combat damage, while Swampfire returns a creature card from your graveyard to your hand on entry. This Ben 10 Magic Proxy deck suits players who enjoy a flexible creature toolbox, choosing between removal, pressure and recovery as the table changes.

A 100-card Commander deck plus 4 tokens, with the existing Bracket 4 designation.