The current iterations of this deck use some generated tokens before casting this at x=2, hitting the only two creatures in the deck: Worldspine Wurm and Xenagos, God of Revels, giving them a 30/30 trample crashing in that leaves behind three 5/5 tokens if you kill it without an exile effect
Once you announce that you're casting Sentry Bot, no player may take actions until you're done casting it
Its also a piece of Urza, Planeswalker, a Melded planeswalker card created by Urza, Lord Protector, and The Mightstone and the Weakstone Artifact Melding together
Afterward, broad answers like counterspells, discard, and targeted removal tend to fair best
The halfling can threaten to end games fairly early with plenty of Ring-tempting options in black and white, and nearly all of them cost four or less
Locations add new strategies such as bonuses when characters visit or advantages just from being in play