Kaalia of the Vast - Intelligence

Fix Mardu mana, cast Kaalia with haste or protection, attack an opponent safely, deploy the best Angel, Demon, or Dragon from hand, then protect or recur Kaalia and refill before repeating.

Kaalia's triggered ability triggers only when she attacks an opponent, not a planeswalker or battle.

The Angel, Demon, or Dragon enters tapped and attacking the opponent Kaalia attacked, but it was never declared as an attacker, so ordinary attack triggers do not trigger.

Attack restrictions that apply while declaring attackers, including defender, do not stop the chosen creature from entering attacking.

Removing Kaalia after her triggered ability is on the stack does not remove that ability from the stack.

If the attacked opponent leaves the game before the trigger resolves, the chosen creature may enter tapped, but it is not attacking.

Master of Cruelties' unblocked trigger is checked after blockers rather than when attackers are declared, so the creature can trigger after Kaalia puts it onto the battlefield attacking.

Master of Cruelties assigns no combat damage after its trigger resolves; Kaalia must still connect for the final combat damage.

Summoning sickness keeps Kaalia from attacking unless she has haste, and repeated removal increases commander tax.

Accelerate Kaalia, protect the first attack, and choose threats with immediate impact.

Use a lower curve of evasive threats and make Kaalia one pressure source among several.

Use the graveyard as a second route for expensive Angels, Demons, and Dragons.

Use only Kaalia-required or separately verified lines with explicit prerequisites and interruption points.