Dynaheir, Invoker Adept

The activated ability in the last line is the engine, and its shape is the whole design. Tapping doesn't copy anything on its own: it creates a delayed trigger that fires the next time you activate a nonmana ability this turn by spending four or more mana on it, then copies that ability with the option to redirect. The four-mana floor is a deliberate price gate: it steers the build toward abilities where doubling actually accrues value: expensive draw buttons, big X-style pump or token engines, ability-based direct damage, the kind of double-digit activation whose payoff persists after both instances resolve. It pointedly does not reward cheap buttons, an unusual pull in a color trio that normally prizes efficiency, and it sidesteps the trap of copying equip or reconfigure, where the copy attaches first only for the original activation to yank the gear back. The overlooked line is the haste-granting static, which strips summoning sickness from your other creatures' tap abilities: a creature cast this turn can immediately tap for a costly activation, or an engine piece can come online a turn ahead of schedule. Read together, both static abilities and the delayed-copy activation share one intent: a Jeskai commander built to weaponize a turn full of activated abilities, accelerating the expensive ones into play and then doubling the best of them. The 4/4 haste body is nearly incidental, there to pressure life totals while the engine assembles.